21353402952 has 256 divisors, whose sum is σ = 71204659200. Its totient is φ = 5797059840.

The previous prime is 21353402927. The next prime is 21353402971. The reversal of 21353402952 is 25920435312.

21353402952 is a `hidden beast` number, since 21 + 3 + 5 + 340 + 295 + 2 = 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 63 ways as a sum of consecutive naturals, for example, 5457877 + ... + 5461787.

It is an arithmetic number, because the mean of its divisors is an integer number (278143200).

Almost surely, 2^21353402952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21353402952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35602329600).

21353402952 is an abundant number, since it is smaller than the sum of its proper divisors (49851256248).

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

21353402952 is a wasteful number, since it uses less digits than its factorization.

21353402952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113 (or 4103 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The spelling of 21353402952 in words is "twenty-one billion, three hundred fifty-three million, four hundred two thousand, nine hundred fifty-two".