21002412552 has 32 divisors (see below), whose sum is σ = 57279307680. Its totient is φ = 6364367360.

The previous prime is 21002412539. The next prime is 21002412553. The reversal of 21002412552 is 25521420012.

It is a super-2 number, since 2×21002412552² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21002412553) 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, 39777033 + ... + 39777560.

It is an arithmetic number, because the mean of its divisors is an integer number (1789978365).

Almost surely, 2^21002412552 is an apocalyptic number.

21002412552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21002412552 is an abundant number, since it is smaller than the sum of its proper divisors (36276895128).

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

21002412552 is a wasteful number, since it uses less digits than its factorization.

21002412552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79554613 (or 79554609 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21002412552 its reverse (25521420012), we get a palindrome (46523832564).

The spelling of 21002412552 in words is "twenty-one billion, two million, four hundred twelve thousand, five hundred fifty-two".