21022001120121 has 32 divisors (see below), whose sum is σ = 29932941696000. Its totient is φ = 13094150307840.

The previous prime is 21022001120093. The next prime is 21022001120161. The reversal of 21022001120121 is 12102110022012.

It is not a de Polignac number, because 21022001120121 - 2⁵ = 21022001120089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21022001120121.

It is not an unprimeable number, because it can be changed into a prime (21022001120161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48462225 + ... + 48894081.

It is an arithmetic number, because the mean of its divisors is an integer number (935404428000).

Almost surely, 2^{21022001120121} is an apocalyptic number.

It is an amenable number.

21022001120121 is a deficient number, since it is larger than the sum of its proper divisors (8910940575879).

21022001120121 is a wasteful number, since it uses less digits than its factorization.

21022001120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449969.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21022001120121 its reverse (12102110022012), we get a palindrome (33124111142133).

The spelling of 21022001120121 in words is "twenty-one trillion, twenty-two billion, one million, one hundred twenty thousand, one hundred twenty-one".