21968496051 has 16 divisors (see below), whose sum is σ = 29992913280. Its totient is φ = 14295335040.

The previous prime is 21968495999. The next prime is 21968496073. The reversal of 21968496051 is 15069486912.

It is not a de Polignac number, because 21968496051 - 2⁹ = 21968495539 is a prime.

It is a super-2 number, since 2×21968496051² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21968495985 and 21968496003.

It is not an unprimeable number, because it can be changed into a prime (21968996051) 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 15 ways as a sum of consecutive naturals, for example, 134896 + ... + 249266.

It is an arithmetic number, because the mean of its divisors is an integer number (1874557080).

Almost surely, 2^21968496051 is an apocalyptic number.

21968496051 is a deficient number, since it is larger than the sum of its proper divisors (8024417229).

21968496051 is a wasteful number, since it uses less digits than its factorization.

21968496051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115906.

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 21968496051 in words is "twenty-one billion, nine hundred sixty-eight million, four hundred ninety-six thousand, fifty-one".