21233274420 has 24 divisors (see below), whose sum is σ = 59453168544. Its totient is φ = 5662206496.

The previous prime is 21233274401. The next prime is 21233274437. The reversal of 21233274420 is 2447233212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176943894 + ... + 176944013.

It is an arithmetic number, because the mean of its divisors is an integer number (2477215356).

Almost surely, 2^21233274420 is an apocalyptic number.

21233274420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21233274420 is an abundant number, since it is smaller than the sum of its proper divisors (38219894124).

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

21233274420 is a wasteful number, since it uses less digits than its factorization.

21233274420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353887919 (or 353887917 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

The spelling of 21233274420 in words is "twenty-one billion, two hundred thirty-three million, two hundred seventy-four thousand, four hundred twenty".