21000031130101 has 8 divisors (see below), whose sum is σ = 21052646594840. Its totient is φ = 20947421864448.

The previous prime is 21000031130087. The next prime is 21000031130119. The reversal of 21000031130101 is 10103113000012.

It can be written as a sum of positive squares in 4 ways, for example, as 14608104423025 + 6391926707076 = 3822055^2 + 2528226^2 .

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 21000031130101 - 2¹⁵ = 21000031097333 is a prime.

It is a super-2 number, since 2×21000031130101² (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 (21000031130171) 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, 5271475 + ... + 8353951.

It is an arithmetic number, because the mean of its divisors is an integer number (2631580824355).

Almost surely, 2^{21000031130101} is an apocalyptic number.

It is an amenable number.

21000031130101 is a deficient number, since it is larger than the sum of its proper divisors (52615464739).

21000031130101 is a wasteful number, since it uses less digits than its factorization.

21000031130101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3099543.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21000031130101 its reverse (10103113000012), we get a palindrome (31103144130113).

The spelling of 21000031130101 in words is "twenty-one trillion, thirty-one million, one hundred thirty thousand, one hundred one".