21101199975 has 48 divisors (see below), whose sum is σ = 39230822400. Its totient is φ = 11118353760.

The previous prime is 21101199953. The next prime is 21101199991. The reversal of 21101199975 is 57999110112.

It is not a de Polignac number, because 21101199975 - 2⁵ = 21101199943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21101199975.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132295 + ... + 244344.

It is an arithmetic number, because the mean of its divisors is an integer number (817308800).

Almost surely, 2^21101199975 is an apocalyptic number.

21101199975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21101199975 is a deficient number, since it is larger than the sum of its proper divisors (18129622425).

21101199975 is a wasteful number, since it uses less digits than its factorization.

21101199975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376741 (or 376730 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 45.

The spelling of 21101199975 in words is "twenty-one billion, one hundred one million, one hundred ninety-nine thousand, nine hundred seventy-five".