21000021111201 has 24 divisors (see below), whose sum is σ = 31081612185792. Its totient is φ = 12601272772000.

The previous prime is 21000021111161. The next prime is 21000021111229. The reversal of 21000021111201 is 10211112000012.

It is not a de Polignac number, because 21000021111201 - 2⁷ = 21000021111073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21000021111001) 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, 286355901 + ... + 286429226.

It is an arithmetic number, because the mean of its divisors is an integer number (1295067174408).

Almost surely, 2^{21000021111201} is an apocalyptic number.

It is an amenable number.

21000021111201 is a deficient number, since it is larger than the sum of its proper divisors (10081591074591).

21000021111201 is a wasteful number, since it uses less digits than its factorization.

21000021111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572785253 (or 572785242 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21000021111201 its reverse (10211112000012), we get a palindrome (31211133111213).

The spelling of 21000021111201 in words is "twenty-one trillion, twenty-one million, one hundred eleven thousand, two hundred one".