21321021122 has 4 divisors (see below), whose sum is σ = 31981531686. Its totient is φ = 10660510560.

The previous prime is 21321021107. The next prime is 21321021131. The reversal of 21321021122 is 22112012312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11414999281 + 9906021841 = 106841^2 + 99529^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21321021122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330255279 + ... + 5330255282.

Almost surely, 2^21321021122 is an apocalyptic number.

21321021122 is a deficient number, since it is larger than the sum of its proper divisors (10660510564).

21321021122 is a wasteful number, since it uses less digits than its factorization.

21321021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10660510563.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21321021122 its reverse (22112012312), we get a palindrome (43433033434).

The spelling of 21321021122 in words is "twenty-one billion, three hundred twenty-one million, twenty-one thousand, one hundred twenty-two".