211212121000 has 32 divisors (see below), whose sum is σ = 494236365480. Its totient is φ = 84484848000.

The previous prime is 211212120991. The next prime is 211212121067. The reversal of 211212121000 is 121212112.

It can be written as a sum of positive squares in 4 ways, for example, as 23121635364 + 188090485636 = 152058^2 + 433694^2 .

It is a super-2 number, since 2×211212121000² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105605061 + ... + 105607060.

Almost surely, 2^211212121000 is an apocalyptic number.

211212121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212121000 is an abundant number, since it is smaller than the sum of its proper divisors (283024244480).

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

211212121000 is a wasteful number, since it uses less digits than its factorization.

211212121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211212142 (or 211212128 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211212121000 its reverse (121212112), we get a palindrome (211333333112).

The spelling of 211212121000 in words is "two hundred eleven billion, two hundred twelve million, one hundred twenty-one thousand".