211221210000999 has 48 divisors (see below), whose sum is σ = 312598440906752. Its totient is φ = 126755952840000.

The previous prime is 211221210000989. The next prime is 211221210001003. The reversal of 211221210000999 is 999000012122112.

It is a happy number.

It is not a de Polignac number, because 211221210000999 - 2⁸ = 211221210000743 is a prime.

It is a super-2 number, since 2×211221210000999² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211221210000929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 341838069 + ... + 342455409.

Almost surely, 2^{211221210000999} is an apocalyptic number.

211221210000999 is a deficient number, since it is larger than the sum of its proper divisors (101377230905753).

211221210000999 is a wasteful number, since it uses less digits than its factorization.

211221210000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626620 (or 626609 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The spelling of 211221210000999 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred ten million, nine hundred ninety-nine", and thus it is an aban number.