21122451022 has 4 divisors (see below), whose sum is σ = 31683676536. Its totient is φ = 10561225510.

The previous prime is 21122450977. The next prime is 21122451037. The reversal of 21122451022 is 22015422112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21122450984 and 21122451002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280612754 + ... + 5280612757.

It is an arithmetic number, because the mean of its divisors is an integer number (7920919134).

Almost surely, 2^21122451022 is an apocalyptic number.

21122451022 is a deficient number, since it is larger than the sum of its proper divisors (10561225514).

21122451022 is a wasteful number, since it uses less digits than its factorization.

21122451022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561225513.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 21122451022 its reverse (22015422112), we get a palindrome (43137873134).

The spelling of 21122451022 in words is "twenty-one billion, one hundred twenty-two million, four hundred fifty-one thousand, twenty-two".