21002412051 has 16 divisors (see below), whose sum is σ = 32944960800. Its totient is φ = 13177983744.

The previous prime is 21002412037. The next prime is 21002412059. The reversal of 21002412051 is 15021420012.

It is not a de Polignac number, because 21002412051 - 2¹⁷ = 21002280979 is a prime.

It is a super-2 number, since 2×21002412051² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21002412059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22877986 + ... + 22878903.

It is an arithmetic number, because the mean of its divisors is an integer number (2059060050).

Almost surely, 2^21002412051 is an apocalyptic number.

21002412051 is a deficient number, since it is larger than the sum of its proper divisors (11942548749).

21002412051 is a wasteful number, since it uses less digits than its factorization.

21002412051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45756915 (or 45756909 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 21002412051 its reverse (15021420012), we get a palindrome (36023832063).

The spelling of 21002412051 in words is "twenty-one billion, two million, four hundred twelve thousand, fifty-one".