21010022021121 has 64 divisors (see below), whose sum is σ = 32594800619520. Its totient is φ = 11790826629120.

The previous prime is 21010022021113. The next prime is 21010022021173. The reversal of 21010022021121 is 12112022001012.

It is not a de Polignac number, because 21010022021121 - 2³ = 21010022021113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21010022021121.

It is not an unprimeable number, because it can be changed into a prime (21010022021921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 119271516 + ... + 119447538.

It is an arithmetic number, because the mean of its divisors is an integer number (509293759680).

Almost surely, 2^{21010022021121} is an apocalyptic number.

21010022021121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21010022021121 is a deficient number, since it is larger than the sum of its proper divisors (11584778598399).

21010022021121 is a wasteful number, since it uses less digits than its factorization.

21010022021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176606.

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

Adding to 21010022021121 its reverse (12112022001012), we get a palindrome (33122044022133).

The spelling of 21010022021121 in words is "twenty-one trillion, ten billion, twenty-two million, twenty-one thousand, one hundred twenty-one".