21211857162240 has 104 divisors (see below), whose sum is σ = 67869657234048. Its totient is φ = 5656495226880.

The previous prime is 21211857162233. The next prime is 21211857162247. The reversal of 21211857162240 is 4226175811212.

It is an interprime number because it is at equal distance from previous prime (21211857162233) and next prime (21211857162247).

It is a junction number, because it is equal to n+sod(n) for n = 21211857162192 and 21211857162201.

It is not an unprimeable number, because it can be changed into a prime (21211857162247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172561096 + ... + 172683975.

Almost surely, 2^{21211857162240} is an apocalyptic number.

21211857162240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21211857162240 is an abundant number, since it is smaller than the sum of its proper divisors (46657800071808).

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

21211857162240 is an equidigital number, since it uses as much as digits as its factorization.

21211857162240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345245103 (or 345245081 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 42.

The spelling of 21211857162240 in words is "twenty-one trillion, two hundred eleven billion, eight hundred fifty-seven million, one hundred sixty-two thousand, two hundred forty".