21210201111021 has 16 divisors (see below), whose sum is σ = 30577010748480. Its totient is φ = 13000429728000.

The previous prime is 21210201110957. The next prime is 21210201111059. The reversal of 21210201111021 is 12011110201212.

It is a happy number.

It is not a de Polignac number, because 21210201111021 - 2⁶ = 21210201110957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210201111091) 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, 1083359356 + ... + 1083378933.

It is an arithmetic number, because the mean of its divisors is an integer number (1911063171780).

Almost surely, 2^{21210201111021} is an apocalyptic number.

It is an amenable number.

21210201111021 is a deficient number, since it is larger than the sum of its proper divisors (9366809637459).

21210201111021 is a wasteful number, since it uses less digits than its factorization.

21210201111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166738556.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21210201111021 its reverse (12011110201212), we get a palindrome (33221311312233).

The spelling of 21210201111021 in words is "twenty-one trillion, two hundred ten billion, two hundred one million, one hundred eleven thousand, twenty-one".