15421124640 has 96 divisors (see below), whose sum is σ = 50688602496. Its totient is φ = 3933501440.

The previous prime is 15421124633. The next prime is 15421124657. The reversal of 15421124640 is 4642112451.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×15421124640² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15421124598 and 15421124607.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 687381 + ... + 709460.

It is an arithmetic number, because the mean of its divisors is an integer number (528006276).

Almost surely, 2^15421124640 is an apocalyptic number.

15421124640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15421124640 is an abundant number, since it is smaller than the sum of its proper divisors (35267477856).

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

15421124640 is a wasteful number, since it uses less digits than its factorization.

15421124640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1396882 (or 1396874 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The spelling of 15421124640 in words is "fifteen billion, four hundred twenty-one million, one hundred twenty-four thousand, six hundred forty".