21122271374 has 4 divisors (see below), whose sum is σ = 31683407064. Its totient is φ = 10561135686.

The previous prime is 21122271361. The next prime is 21122271377. The reversal of 21122271374 is 47317222112.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21122271374.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122271377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280567842 + ... + 5280567845.

It is an arithmetic number, because the mean of its divisors is an integer number (7920851766).

Almost surely, 2^21122271374 is an apocalyptic number.

21122271374 is a deficient number, since it is larger than the sum of its proper divisors (10561135690).

21122271374 is a wasteful number, since it uses less digits than its factorization.

21122271374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10561135689.

The product of its digits is 9408, while the sum is 32.

Adding to 21122271374 its reverse (47317222112), we get a palindrome (68439493486).

The spelling of 21122271374 in words is "twenty-one billion, one hundred twenty-two million, two hundred seventy-one thousand, three hundred seventy-four".