21411299520 has 252 divisors, whose sum is σ = 79748609616. Its totient is φ = 5270353920.

The previous prime is 21411299513. The next prime is 21411299537. The reversal of 21411299520 is 2599211412.

21411299520 is a `hidden beast` number, since 2 + 1 + 4 + 1 + 129 + 9 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 464725 + ... + 508715.

Almost surely, 2^21411299520 is an apocalyptic number.

21411299520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21411299520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39874304808).

21411299520 is an abundant number, since it is smaller than the sum of its proper divisors (58337310096).

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

21411299520 is a wasteful number, since it uses less digits than its factorization.

21411299520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44040 (or 44014 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The spelling of 21411299520 in words is "twenty-one billion, four hundred eleven million, two hundred ninety-nine thousand, five hundred twenty".