21100032001 has 8 divisors (see below), whose sum is σ = 22379940360. Its totient is φ = 19824427008.

The previous prime is 21100031993. The next prime is 21100032029. The reversal of 21100032001 is 10023000112.

It can be written as a sum of positive squares in 4 ways, for example, as 15531141376 + 5568890625 = 124624^2 + 74625^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21100032001 - 2³ = 21100031993 is a prime.

It is a super-2 number, since 2×21100032001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21100032071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065736 + ... + 1085353.

It is an arithmetic number, because the mean of its divisors is an integer number (2797492545).

Almost surely, 2^21100032001 is an apocalyptic number.

It is an amenable number.

21100032001 is a deficient number, since it is larger than the sum of its proper divisors (1279908359).

21100032001 is a wasteful number, since it uses less digits than its factorization.

21100032001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2151683.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 21100032001 its reverse (10023000112), we get a palindrome (31123032113).

The spelling of 21100032001 in words is "twenty-one billion, one hundred million, thirty-two thousand, one".