21113031401 has 32 divisors (see below), whose sum is σ = 28912896000. Its totient is φ = 14908164480.

The previous prime is 21113031377. The next prime is 21113031403. The reversal of 21113031401 is 10413031112.

It is not a de Polignac number, because 21113031401 - 2¹⁸ = 21112769257 is a prime.

It is a super-2 number, since 2×21113031401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113031401.

It is not an unprimeable number, because it can be changed into a prime (21113031403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 280076 + ... + 347373.

It is an arithmetic number, because the mean of its divisors is an integer number (903528000).

Almost surely, 2^21113031401 is an apocalyptic number.

It is an amenable number.

21113031401 is a deficient number, since it is larger than the sum of its proper divisors (7799864599).

21113031401 is a wasteful number, since it uses less digits than its factorization.

21113031401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627509.

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

Adding to 21113031401 its reverse (10413031112), we get a palindrome (31526062513).

The spelling of 21113031401 in words is "twenty-one billion, one hundred thirteen million, thirty-one thousand, four hundred one".