21533407412 has 12 divisors (see below), whose sum is σ = 41109232416. Its totient is φ = 9787912440.

The previous prime is 21533407411. The next prime is 21533407417. The reversal of 21533407412 is 21470433512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21533407411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244697768 + ... + 244697855.

It is an arithmetic number, because the mean of its divisors is an integer number (3425769368).

Almost surely, 2^21533407412 is an apocalyptic number.

21533407412 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21533407412 is a deficient number, since it is larger than the sum of its proper divisors (19575825004).

21533407412 is a wasteful number, since it uses less digits than its factorization.

21533407412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489395638 (or 489395636 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21533407412 in words is "twenty-one billion, five hundred thirty-three million, four hundred seven thousand, four hundred twelve".