21021103000031 has 4 divisors (see below), whose sum is σ = 21021180013200. Its totient is φ = 21021025986864.

The previous prime is 21021103000021. The next prime is 21021103000043. The reversal of 21021103000031 is 13000030112012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021103000031 is a prime.

It is a super-2 number, since 2×21021103000031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021103000021) 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, 38095691 + ... + 38643548.

It is an arithmetic number, because the mean of its divisors is an integer number (5255295003300).

Almost surely, 2^{21021103000031} is an apocalyptic number.

21021103000031 is a deficient number, since it is larger than the sum of its proper divisors (77013169).

21021103000031 is an equidigital number, since it uses as much as digits as its factorization.

21021103000031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77013168.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21021103000031 its reverse (13000030112012), we get a palindrome (34021133112043).

The spelling of 21021103000031 in words is "twenty-one trillion, twenty-one billion, one hundred three million, thirty-one", and thus it is an aban number.