21203320122 has 24 divisors (see below), whose sum is σ = 47182164276. Its totient is φ = 6876752256.

The previous prime is 21203320111. The next prime is 21203320141. The reversal of 21203320122 is 22102330212.

21203320122 is a `hidden beast` number, since 21 + 203 + 320 + 122 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21193827561 + 9492561 = 145581^2 + 3081^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21203320095 and 21203320104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15917743 + ... + 15919074.

Almost surely, 2^21203320122 is an apocalyptic number.

21203320122 is an abundant number, since it is smaller than the sum of its proper divisors (25978844154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203320122 is a wasteful number, since it uses less digits than its factorization.

21203320122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31836862 (or 31836859 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21203320122 its reverse (22102330212), we get a palindrome (43305650334).

The spelling of 21203320122 in words is "twenty-one billion, two hundred three million, three hundred twenty thousand, one hundred twenty-two".