21421500452 has 12 divisors (see below), whose sum is σ = 40895591856. Its totient is φ = 9737045640.

The previous prime is 21421500449. The next prime is 21421500487. The reversal of 21421500452 is 25400512412.

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, 243426098 + ... + 243426185.

It is an arithmetic number, because the mean of its divisors is an integer number (3407965988).

Almost surely, 2^21421500452 is an apocalyptic number.

21421500452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21421500452 is a deficient number, since it is larger than the sum of its proper divisors (19474091404).

21421500452 is a wasteful number, since it uses less digits than its factorization.

21421500452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486852298 (or 486852296 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 21421500452 in words is "twenty-one billion, four hundred twenty-one million, five hundred thousand, four hundred fifty-two".