211210021998 has 48 divisors (see below), whose sum is σ = 458470028016. Its totient is φ = 70272956160.

The previous prime is 211210021961. The next prime is 211210021999. The reversal of 211210021998 is 899120012112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210021999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26843661 + ... + 26851527.

It is an arithmetic number, because the mean of its divisors is an integer number (9551458917).

Almost surely, 2^211210021998 is an apocalyptic number.

211210021998 is an abundant number, since it is smaller than the sum of its proper divisors (247260006018).

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

211210021998 is a wasteful number, since it uses less digits than its factorization.

211210021998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449 (or 10446 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The spelling of 211210021998 in words is "two hundred eleven billion, two hundred ten million, twenty-one thousand, nine hundred ninety-eight".