21020100122 has 16 divisors (see below), whose sum is σ = 36039416832. Its totient is φ = 9007374480.

The previous prime is 21020100119. The next prime is 21020100151. The reversal of 21020100122 is 22100102012.

It is a happy number.

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, 6023 + ... + 205125.

It is an arithmetic number, because the mean of its divisors is an integer number (2252463552).

Almost surely, 2^21020100122 is an apocalyptic number.

21020100122 is a deficient number, since it is larger than the sum of its proper divisors (15019316710).

21020100122 is a wasteful number, since it uses less digits than its factorization.

21020100122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206653.

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

Adding to 21020100122 its reverse (22100102012), we get a palindrome (43120202134).

The spelling of 21020100122 in words is "twenty-one billion, twenty million, one hundred thousand, one hundred twenty-two".