21402132024 has 64 divisors (see below), whose sum is σ = 65852720640. Its totient is φ = 5644517760.

The previous prime is 21402132023. The next prime is 21402132041. The reversal of 21402132024 is 42023120412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402132023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4897572 + ... + 4901939.

It is an arithmetic number, because the mean of its divisors is an integer number (1028948760).

Almost surely, 2^21402132024 is an apocalyptic number.

21402132024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21402132024 is an abundant number, since it is smaller than the sum of its proper divisors (44450588616).

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

21402132024 is a wasteful number, since it uses less digits than its factorization.

21402132024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9799540 (or 9799536 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21402132024 its reverse (42023120412), we get a palindrome (63425252436).

The spelling of 21402132024 in words is "twenty-one billion, four hundred two million, one hundred thirty-two thousand, twenty-four".