21113342474 has 16 divisors (see below), whose sum is σ = 38323378368. Its totient is φ = 8516306112.

The previous prime is 21113342473. The next prime is 21113342483. The reversal of 21113342474 is 47424331112.

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 21113342474.

It is not an unprimeable number, because it can be changed into a prime (21113342473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44355524 + ... + 44355999.

It is an arithmetic number, because the mean of its divisors is an integer number (2395211148).

Almost surely, 2^21113342474 is an apocalyptic number.

21113342474 is a deficient number, since it is larger than the sum of its proper divisors (17210035894).

21113342474 is a wasteful number, since it uses less digits than its factorization.

21113342474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88711549.

The product of its digits is 16128, while the sum is 32.

Adding to 21113342474 its reverse (47424331112), we get a palindrome (68537673586).

The spelling of 21113342474 in words is "twenty-one billion, one hundred thirteen million, three hundred forty-two thousand, four hundred seventy-four".