21010131021 has 8 divisors (see below), whose sum is σ = 30560190624. Its totient is φ = 12733412720.

The previous prime is 21010130993. The next prime is 21010131031. The reversal of 21010131021 is 12013101012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21010131021 - 2⁵ = 21010130989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010130988 and 21010131006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010131031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318335286 + ... + 318335351.

It is an arithmetic number, because the mean of its divisors is an integer number (3820023828).

Almost surely, 2^21010131021 is an apocalyptic number.

It is an amenable number.

21010131021 is a deficient number, since it is larger than the sum of its proper divisors (9550059603).

21010131021 is a wasteful number, since it uses less digits than its factorization.

21010131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636670651.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21010131021 its reverse (12013101012), we get a palindrome (33023232033).

The spelling of 21010131021 in words is "twenty-one billion, ten million, one hundred thirty-one thousand, twenty-one".