211220021998 has 8 divisors (see below), whose sum is σ = 316834026192. Its totient is φ = 105608679936.

The previous prime is 211220021981. The next prime is 211220022011. The reversal of 211220021998 is 899120022112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×211220021998² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453690 + ... + 792637.

It is an arithmetic number, because the mean of its divisors is an integer number (39604253274).

Almost surely, 2^211220021998 is an apocalyptic number.

211220021998 is a deficient number, since it is larger than the sum of its proper divisors (105614004194).

211220021998 is a wasteful number, since it uses less digits than its factorization.

211220021998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331066.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 211220021998 in words is "two hundred eleven billion, two hundred twenty million, twenty-one thousand, nine hundred ninety-eight".