21145088424 has 32 divisors (see below), whose sum is σ = 54152058240. Its totient is φ = 6876451200.

The previous prime is 21145088423. The next prime is 21145088431. The reversal of 21145088424 is 42488054112.

It is a super-2 number, since 2×21145088424² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21145088423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10743472 + ... + 10745439.

It is an arithmetic number, because the mean of its divisors is an integer number (1692251820).

Almost surely, 2^21145088424 is an apocalyptic number.

21145088424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21145088424 is an abundant number, since it is smaller than the sum of its proper divisors (33006969816).

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

21145088424 is a wasteful number, since it uses less digits than its factorization.

21145088424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21488961 (or 21488957 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 39.

The spelling of 21145088424 in words is "twenty-one billion, one hundred forty-five million, eighty-eight thousand, four hundred twenty-four".