211311255504220 has 48 divisors (see below), whose sum is σ = 444038290930080. Its totient is φ = 84470286219264.

The previous prime is 211311255504137. The next prime is 211311255504221. The reversal of 211311255504220 is 22405552113112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211311255504221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 997308651 + ... + 997520509.

It is an arithmetic number, because the mean of its divisors is an integer number (9250797727710).

Almost surely, 2^{211311255504220} is an apocalyptic number.

211311255504220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211311255504220 is an abundant number, since it is smaller than the sum of its proper divisors (232727035425860).

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

211311255504220 is a wasteful number, since it uses less digits than its factorization.

211311255504220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243622 (or 243620 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The spelling of 211311255504220 in words is "two hundred eleven trillion, three hundred eleven billion, two hundred fifty-five million, five hundred four thousand, two hundred twenty".