212021121999 has 32 divisors (see below), whose sum is σ = 299301396480. Its totient is φ = 133132781952.

The previous prime is 212021121997. The next prime is 212021122003. The reversal of 212021121999 is 999121120212.

It is a happy number.

It is not a de Polignac number, because 212021121999 - 2¹ = 212021121997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021121997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6905109 + ... + 6935745.

It is an arithmetic number, because the mean of its divisors is an integer number (9353168640).

Almost surely, 2^212021121999 is an apocalyptic number.

212021121999 is a deficient number, since it is larger than the sum of its proper divisors (87280274481).

212021121999 is a wasteful number, since it uses less digits than its factorization.

212021121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31359.

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

The spelling of 212021121999 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, nine hundred ninety-nine".