21210020122111 has 8 divisors (see below), whose sum is σ = 21412193331200. Its totient is φ = 21008802815352.

The previous prime is 21210020122079. The next prime is 21210020122133. The reversal of 21210020122111 is 11122102001212.

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 21210020122111 - 2⁵ = 21210020122079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210020120111) 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, 238930995 + ... + 239019748.

It is an arithmetic number, because the mean of its divisors is an integer number (2676524166400).

Almost surely, 2^{21210020122111} is an apocalyptic number.

21210020122111 is a deficient number, since it is larger than the sum of its proper divisors (202173209089).

21210020122111 is a wasteful number, since it uses less digits than its factorization.

21210020122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477951165.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21210020122111 its reverse (11122102001212), we get a palindrome (32332122123323).

The spelling of 21210020122111 in words is "twenty-one trillion, two hundred ten billion, twenty million, one hundred twenty-two thousand, one hundred eleven".