212121222000 has 160 divisors (see below), whose sum is σ = 702362766144. Its totient is φ = 55036800000.

The previous prime is 212121221999. The next prime is 212121222029. The reversal of 212121222000 is 222121212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 255751 + ... + 699750.

Almost surely, 2^212121222000 is an apocalyptic number.

212121222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121222000 is an abundant number, since it is smaller than the sum of its proper divisors (490241544144).

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

212121222000 is a wasteful number, since it uses less digits than its factorization.

212121222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955564 (or 955548 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 212121222000 its reverse (222121212), we get a palindrome (212343343212).

The spelling of 212121222000 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand".