21021222210121 has 16 divisors (see below), whose sum is σ = 24054789927168. Its totient is φ = 17995298587200.

The previous prime is 21021222210119. The next prime is 21021222210161. The reversal of 21021222210121 is 12101222212012.

It is a cyclic number.

It is not a de Polignac number, because 21021222210121 - 2¹ = 21021222210119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021222210161) 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, 24690636 + ... + 25527826.

It is an arithmetic number, because the mean of its divisors is an integer number (1503424370448).

Almost surely, 2^{21021222210121} is an apocalyptic number.

It is an amenable number.

21021222210121 is a deficient number, since it is larger than the sum of its proper divisors (3033567717047).

21021222210121 is a wasteful number, since it uses less digits than its factorization.

21021222210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841752.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21021222210121 its reverse (12101222212012), we get a palindrome (33122444422133).

The spelling of 21021222210121 in words is "twenty-one trillion, twenty-one billion, two hundred twenty-two million, two hundred ten thousand, one hundred twenty-one".