21408733333420 has 12 divisors (see below), whose sum is σ = 44958340000224. Its totient is φ = 8563493333360.

The previous prime is 21408733333369. The next prime is 21408733333423. The reversal of 21408733333420 is 2433333780412.

It is a super-5 number, since 5×21408733333420⁵ (a number of 68 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (21408733333423) 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, 535218333316 + ... + 535218333355.

It is an arithmetic number, because the mean of its divisors is an integer number (3746528333352).

Almost surely, 2^{21408733333420} is an apocalyptic number.

21408733333420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21408733333420 is an abundant number, since it is smaller than the sum of its proper divisors (23549606666804).

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

21408733333420 is a wasteful number, since it uses less digits than its factorization.

21408733333420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070436666680 (or 1070436666678 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 43.

The spelling of 21408733333420 in words is "twenty-one trillion, four hundred eight billion, seven hundred thirty-three million, three hundred thirty-three thousand, four hundred twenty".