101212331021 has 4 divisors (see below), whose sum is σ = 102255757212. Its totient is φ = 100168904832.

The previous prime is 101212331009. The next prime is 101212331041. The reversal of 101212331021 is 120133212101.

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 84324028996 + 16888302025 = 290386^2 + 129955^2 .

It is a cyclic number.

It is not a de Polignac number, because 101212331021 - 2⁶ = 101212330957 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 (101212331041) 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, 521712950 + ... + 521713143.

It is an arithmetic number, because the mean of its divisors is an integer number (25563939303).

Almost surely, 2^101212331021 is an apocalyptic number.

It is an amenable number.

101212331021 is a deficient number, since it is larger than the sum of its proper divisors (1043426191).

101212331021 is an equidigital number, since it uses as much as digits as its factorization.

101212331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043426190.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 101212331021 its reverse (120133212101), we get a palindrome (221345543122).

The spelling of 101212331021 in words is "one hundred one billion, two hundred twelve million, three hundred thirty-one thousand, twenty-one".