101211343021 has 4 divisors (see below), whose sum is σ = 107164951452. Its totient is φ = 95257734592.

The previous prime is 101211343007. The next prime is 101211343033. The reversal of 101211343021 is 120343112101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120343112101 = 299393 ⋅401957.

It can be written as a sum of positive squares in 2 ways, for example, as 55152174025 + 46059168996 = 234845^2 + 214614^2 .

It is a cyclic number.

It is not a de Polignac number, because 101211343021 - 2⁷ = 101211342893 is a prime.

It is a super-2 number, since 2×101211343021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101211343021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101211343081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2976804190 + ... + 2976804223.

It is an arithmetic number, because the mean of its divisors is an integer number (26791237863).

Almost surely, 2^101211343021 is an apocalyptic number.

It is an amenable number.

101211343021 is a deficient number, since it is larger than the sum of its proper divisors (5953608431).

101211343021 is an equidigital number, since it uses as much as digits as its factorization.

101211343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5953608430.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 101211343021 its reverse (120343112101), we get a palindrome (221554455122).

The spelling of 101211343021 in words is "one hundred one billion, two hundred eleven million, three hundred forty-three thousand, twenty-one".