21363105951 has 24 divisors (see below), whose sum is σ = 34124225616. Its totient is φ = 12769971840.

The previous prime is 21363105941. The next prime is 21363105961. The reversal of 21363105951 is 15950136312.

It is a happy number.

21363105951 is a `hidden beast` number, since 2 + 1 + 3 + 63 + 1 + 0 + 595 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21363105941) and next prime (21363105961).

It is not a de Polignac number, because 21363105951 - 2⁶ = 21363105887 is a prime.

It is a super-2 number, since 2×21363105951² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363105941) 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 23 ways as a sum of consecutive naturals, for example, 1470780 + ... + 1485233.

It is an arithmetic number, because the mean of its divisors is an integer number (1421842734).

Almost surely, 2^21363105951 is an apocalyptic number.

21363105951 is a deficient number, since it is larger than the sum of its proper divisors (12761119665).

21363105951 is a wasteful number, since it uses less digits than its factorization.

21363105951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956103 (or 2956100 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The spelling of 21363105951 in words is "twenty-one billion, three hundred sixty-three million, one hundred five thousand, nine hundred fifty-one".