21012001013131 has 8 divisors (see below), whose sum is σ = 21020008911440. Its totient is φ = 21003993577728.

The previous prime is 21012001013099. The next prime is 21012001013167. The reversal of 21012001013131 is 13131010021012.

It is a happy number.

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 21012001013131 - 2⁵ = 21012001013099 is a prime.

It is a super-2 number, since 2×21012001013131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012001013831) 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, 110576680 + ... + 110766538.

It is an arithmetic number, because the mean of its divisors is an integer number (2627501113930).

Almost surely, 2^{21012001013131} is an apocalyptic number.

21012001013131 is a deficient number, since it is larger than the sum of its proper divisors (8007898309).

21012001013131 is a wasteful number, since it uses less digits than its factorization.

21012001013131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231453.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21012001013131 its reverse (13131010021012), we get a palindrome (34143011034143).

The spelling of 21012001013131 in words is "twenty-one trillion, twelve billion, one million, thirteen thousand, one hundred thirty-one".