21120100202001 has 16 divisors (see below), whose sum is σ = 28925215694144. Its totient is φ = 13697630950464.

The previous prime is 21120100201997. The next prime is 21120100202017. The reversal of 21120100202001 is 10020200102112.

It is not a de Polignac number, because 21120100202001 - 2² = 21120100201997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120100202501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12342415 + ... + 13949028.

It is an arithmetic number, because the mean of its divisors is an integer number (1807825980884).

Almost surely, 2^{21120100202001} is an apocalyptic number.

It is an amenable number.

21120100202001 is a deficient number, since it is larger than the sum of its proper divisors (7805115492143).

21120100202001 is a wasteful number, since it uses less digits than its factorization.

21120100202001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26298720.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21120100202001 its reverse (10020200102112), we get a palindrome (31140300304113).

The spelling of 21120100202001 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, two hundred two thousand, one".