21203303122 has 4 divisors (see below), whose sum is σ = 31804954686. Its totient is φ = 10601651560.

The previous prime is 21203303087. The next prime is 21203303131. The reversal of 21203303122 is 22130330212.

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., 21199651201 + 3651921 = 145601^2 + 1911^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21203303122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300825779 + ... + 5300825782.

Almost surely, 2^21203303122 is an apocalyptic number.

21203303122 is a deficient number, since it is larger than the sum of its proper divisors (10601651564).

21203303122 is a wasteful number, since it uses less digits than its factorization.

21203303122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601651563.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21203303122 its reverse (22130330212), we get a palindrome (43333633334).

The spelling of 21203303122 in words is "twenty-one billion, two hundred three million, three hundred three thousand, one hundred twenty-two".