21402154452 has 48 divisors (see below), whose sum is σ = 57082669952. Its totient is φ = 6113802240.

The previous prime is 21402154441. The next prime is 21402154481. The reversal of 21402154452 is 25445120412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 524748 + ... + 564060.

Almost surely, 2^21402154452 is an apocalyptic number.

It is an amenable number.

21402154452 is an abundant number, since it is smaller than the sum of its proper divisors (35680515500).

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

21402154452 is a wasteful number, since it uses less digits than its factorization.

21402154452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45808 (or 45806 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21402154452 its reverse (25445120412), we get a palindrome (46847274864).

The spelling of 21402154452 in words is "twenty-one billion, four hundred two million, one hundred fifty-four thousand, four hundred fifty-two".