21100233321990 has 48 divisors (see below), whose sum is σ = 56343325744368. Its totient is φ = 5474655131328.

The previous prime is 21100233321977. The next prime is 21100233321991. The reversal of 21100233321990 is 9912333200112.

21100233321990 is a `hidden beast` number, since 2 + 1 + 10 + 0 + 233 + 321 + 9 + 90 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100233321991) 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, 3168199872 + ... + 3168206531.

It is an arithmetic number, because the mean of its divisors is an integer number (1173819286341).

Almost surely, 2^{21100233321990} is an apocalyptic number.

21100233321990 is an abundant number, since it is smaller than the sum of its proper divisors (35243092422378).

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

21100233321990 is a wasteful number, since it uses less digits than its factorization.

21100233321990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6336406453 (or 6336406450 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The spelling of 21100233321990 in words is "twenty-one trillion, one hundred billion, two hundred thirty-three million, three hundred twenty-one thousand, nine hundred ninety".