21022100121 has 8 divisors (see below), whose sum is σ = 30577600224. Its totient is φ = 12740666720.

The previous prime is 21022100101. The next prime is 21022100161. The reversal of 21022100121 is 12100122012.

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 21022100121 - 2⁵ = 21022100089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21022100097 and 21022100106.

It is not an unprimeable number, because it can be changed into a prime (21022100101) 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, 318516636 + ... + 318516701.

It is an arithmetic number, because the mean of its divisors is an integer number (3822200028).

Almost surely, 2^21022100121 is an apocalyptic number.

It is an amenable number.

21022100121 is a deficient number, since it is larger than the sum of its proper divisors (9555500103).

21022100121 is a wasteful number, since it uses less digits than its factorization.

21022100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637033351.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21022100121 its reverse (12100122012), we get a palindrome (33122222133).

The spelling of 21022100121 in words is "twenty-one billion, twenty-two million, one hundred thousand, one hundred twenty-one".