211220099988 has 48 divisors (see below), whose sum is σ = 527217715584. Its totient is φ = 65581977600.

The previous prime is 211220099983. The next prime is 211220099989. The reversal of 211220099988 is 889990022112.

It is a super-2 number, since 2×211220099988² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 211220099988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220099983) 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, 5317288 + ... + 5356863.

It is an arithmetic number, because the mean of its divisors is an integer number (10983702408).

Almost surely, 2^211220099988 is an apocalyptic number.

It is an amenable number.

211220099988 is an abundant number, since it is smaller than the sum of its proper divisors (315997615596).

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

211220099988 is a wasteful number, since it uses less digits than its factorization.

211220099988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10674272 (or 10674270 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 211220099988 in words is "two hundred eleven billion, two hundred twenty million, ninety-nine thousand, nine hundred eighty-eight".