21263413640154 has 48 divisors (see below), whose sum is σ = 49471514373600. Its totient is φ = 6075072946656.

The previous prime is 21263413640141. The next prime is 21263413640159. The reversal of 21263413640154 is 45104631436212.

It is a super-2 number, since 2×21263413640154² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21263413640159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8533812 + ... + 10740240.

It is an arithmetic number, because the mean of its divisors is an integer number (1030656549450).

Almost surely, 2^{21263413640154} is an apocalyptic number.

21263413640154 is an abundant number, since it is smaller than the sum of its proper divisors (28208100733446).

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

21263413640154 is a wasteful number, since it uses less digits than its factorization.

21263413640154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239227 (or 2239220 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 21263413640154 in words is "twenty-one trillion, two hundred sixty-three billion, four hundred thirteen million, six hundred forty thousand, one hundred fifty-four".