21021200122 has 16 divisors (see below), whose sum is σ = 33959836512. Its totient is φ = 9701374320.

The previous prime is 21021200089. The next prime is 21021200141. The reversal of 21021200122 is 22100212012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 516273 + ... + 555499.

It is an arithmetic number, because the mean of its divisors is an integer number (2122489782).

Almost surely, 2^21021200122 is an apocalyptic number.

21021200122 is a deficient number, since it is larger than the sum of its proper divisors (12938636390).

21021200122 is a wasteful number, since it uses less digits than its factorization.

21021200122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59853.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21021200122 its reverse (22100212012), we get a palindrome (43121412134).

The spelling of 21021200122 in words is "twenty-one billion, twenty-one million, two hundred thousand, one hundred twenty-two".