21502662454 has 64 divisors (see below), whose sum is σ = 41194944000. Its totient is φ = 8362164384.

The previous prime is 21502662437. The next prime is 21502662473. The reversal of 21502662454 is 45426620512.

It is a happy number.

It is a super-2 number, since 2×21502662454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 505729 + ... + 546595.

It is an arithmetic number, because the mean of its divisors is an integer number (643671000).

Almost surely, 2^21502662454 is an apocalyptic number.

21502662454 is a deficient number, since it is larger than the sum of its proper divisors (19692281546).

21502662454 is a wasteful number, since it uses less digits than its factorization.

21502662454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40962 (or 40948 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 21502662454 in words is "twenty-one billion, five hundred two million, six hundred sixty-two thousand, four hundred fifty-four".