101231213221 has 4 divisors (see below), whose sum is σ = 103700267244. Its totient is φ = 98762159200.

The previous prime is 101231213203. The next prime is 101231213227. The reversal of 101231213221 is 122312132101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35536397121 + 65694816100 = 188511^2 + 256310^2 .

It is a cyclic number.

It is not a de Polignac number, because 101231213221 - 2¹³ = 101231205029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101231213227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1234526950 + ... + 1234527031.

It is an arithmetic number, because the mean of its divisors is an integer number (25925066811).

Almost surely, 2^101231213221 is an apocalyptic number.

It is an amenable number.

101231213221 is a deficient number, since it is larger than the sum of its proper divisors (2469054023).

101231213221 is an equidigital number, since it uses as much as digits as its factorization.

101231213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469054022.

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

Adding to 101231213221 its reverse (122312132101), we get a palindrome (223543345322).

The spelling of 101231213221 in words is "one hundred one billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred twenty-one".