21103242122 has 4 divisors (see below), whose sum is σ = 31654863186. Its totient is φ = 10551621060.

The previous prime is 21103242103. The next prime is 21103242137. The reversal of 21103242122 is 22124230112.

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., 18425076121 + 2678166001 = 135739^2 + 51751^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21103242094 and 21103242103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275810529 + ... + 5275810532.

Almost surely, 2^21103242122 is an apocalyptic number.

21103242122 is a deficient number, since it is larger than the sum of its proper divisors (10551621064).

21103242122 is a wasteful number, since it uses less digits than its factorization.

21103242122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551621063.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21103242122 its reverse (22124230112), we get a palindrome (43227472234).

The spelling of 21103242122 in words is "twenty-one billion, one hundred three million, two hundred forty-two thousand, one hundred twenty-two".