211220099990 has 32 divisors (see below), whose sum is σ = 386491914720. Its totient is φ = 83089440000.

The previous prime is 211220099989. The next prime is 211220100031. The reversal of 211220099990 is 99990022112.

It is a happy number.

It is a super-2 number, since 2×211220099990² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4245881 + ... + 4295339.

It is an arithmetic number, because the mean of its divisors is an integer number (12077872335).

Almost surely, 2^211220099990 is an apocalyptic number.

211220099990 is a deficient number, since it is larger than the sum of its proper divisors (175271814730).

211220099990 is a wasteful number, since it uses less digits than its factorization.

211220099990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56528.

The product of its (nonzero) digits is 52488, while the sum is 44.

The spelling of 211220099990 in words is "two hundred eleven billion, two hundred twenty million, ninety-nine thousand, nine hundred ninety".