21201456 has 20 divisors (see below), whose sum is σ = 54770552. Its totient is φ = 7067136.

The previous prime is 21201449. The next prime is 21201461. The reversal of 21201456 is 65410212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220801 + ... + 220896.

Almost surely, 2^21201456 is an apocalyptic number.

It is an amenable number.

21201456 is an abundant number, since it is smaller than the sum of its proper divisors (33569096).

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

21201456 is a wasteful number, since it uses less digits than its factorization.

21201456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441708 (or 441702 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21201456 is about 4604.5038820702. The cubic root of 21201456 is about 276.7718365991.

Adding to 21201456 its reverse (65410212), we get a palindrome (86611668).

The spelling of 21201456 in words is "twenty-one million, two hundred one thousand, four hundred fifty-six".