21020010122 has 16 divisors (see below), whose sum is σ = 32450755680. Its totient is φ = 10207384272.

The previous prime is 21020010113. The next prime is 21020010131. The reversal of 21020010122 is 22101002012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21020010113) and next prime (21020010131).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063313 + ... + 1082900.

It is an arithmetic number, because the mean of its divisors is an integer number (2028172230).

Almost surely, 2^21020010122 is an apocalyptic number.

21020010122 is a deficient number, since it is larger than the sum of its proper divisors (11430745558).

21020010122 is a wasteful number, since it uses less digits than its factorization.

21020010122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2146357.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21020010122 its reverse (22101002012), we get a palindrome (43121012134).

The spelling of 21020010122 in words is "twenty-one billion, twenty million, ten thousand, one hundred twenty-two".