21113142504 has 16 divisors (see below), whose sum is σ = 52782856320. Its totient is φ = 7037714160.

The previous prime is 21113142467. The next prime is 21113142509. The reversal of 21113142504 is 40524131112.

It is a super-2 number, since 2×21113142504² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 879714271 = 21113142504 / (2 + 1 + 1 + 1 + 3 + 1 + 4 + 2 + 5 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (21113142509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439857112 + ... + 439857159.

It is an arithmetic number, because the mean of its divisors is an integer number (3298928520).

Almost surely, 2^21113142504 is an apocalyptic number.

21113142504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21113142504 is an abundant number, since it is smaller than the sum of its proper divisors (31669713816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113142504 is a wasteful number, since it uses less digits than its factorization.

21113142504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879714280 (or 879714276 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21113142504 its reverse (40524131112), we get a palindrome (61637273616).

The spelling of 21113142504 in words is "twenty-one billion, one hundred thirteen million, one hundred forty-two thousand, five hundred four".