21030120122 has 16 divisors (see below), whose sum is σ = 34530384672. Its totient is φ = 9526517520.

The previous prime is 21030120109. The next prime is 21030120149. The reversal of 21030120122 is 22102103012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21030120097 and 21030120106.

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, 1624808 + ... + 1637699.

It is an arithmetic number, because the mean of its divisors is an integer number (2158149042).

Almost surely, 2^21030120122 is an apocalyptic number.

21030120122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21030120122 is a deficient number, since it is larger than the sum of its proper divisors (13500264550).

21030120122 is a wasteful number, since it uses less digits than its factorization.

21030120122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3262813.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21030120122 its reverse (22102103012), we get a palindrome (43132223134).

The spelling of 21030120122 in words is "twenty-one billion, thirty million, one hundred twenty thousand, one hundred twenty-two".