21353404152 has 32 divisors (see below), whose sum is σ = 53388852480. Its totient is φ = 7117089120.

The previous prime is 21353404151. The next prime is 21353404181. The reversal of 21353404152 is 25140435312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353404151) 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, 236523 + ... + 314085.

It is an arithmetic number, because the mean of its divisors is an integer number (1668401640).

Almost surely, 2^21353404152 is an apocalyptic number.

It is an amenable number.

21353404152 is an abundant number, since it is smaller than the sum of its proper divisors (32035448328).

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

21353404152 is a wasteful number, since it uses less digits than its factorization.

21353404152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89043 (or 89039 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21353404152 its reverse (25140435312), we get a palindrome (46493839464).

The spelling of 21353404152 in words is "twenty-one billion, three hundred fifty-three million, four hundred four thousand, one hundred fifty-two".