21120020120001 has 16 divisors (see below), whose sum is σ = 30766504379328. Its totient is φ = 12780647563200.

The previous prime is 21120020119943. The next prime is 21120020120071. The reversal of 21120020120001 is 10002102002112.

It is not a de Polignac number, because 21120020120001 - 2⁷ = 21120020119873 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21120020120071) 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, 484093626 + ... + 484137251.

It is an arithmetic number, because the mean of its divisors is an integer number (1922906523708).

Almost surely, 2^{21120020120001} is an apocalyptic number.

It is an amenable number.

21120020120001 is a deficient number, since it is larger than the sum of its proper divisors (9646484259327).

21120020120001 is a wasteful number, since it uses less digits than its factorization.

21120020120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968231552.

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

Adding to 21120020120001 its reverse (10002102002112), we get a palindrome (31122122122113).

The spelling of 21120020120001 in words is "twenty-one trillion, one hundred twenty billion, twenty million, one hundred twenty thousand, one".