21226974834 has 64 divisors (see below), whose sum is σ = 46563769728. Its totient is φ = 6411225600.

The previous prime is 21226974833. The next prime is 21226974863. The reversal of 21226974834 is 43847962212.

It is not an unprimeable number, because it can be changed into a prime (21226974833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2474637 + ... + 2483199.

It is an arithmetic number, because the mean of its divisors is an integer number (727558902).

Almost surely, 2^21226974834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21226974834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23281884864).

21226974834 is an abundant number, since it is smaller than the sum of its proper divisors (25336794894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21226974834 is a wasteful number, since it uses less digits than its factorization.

21226974834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9163.

The product of its digits is 1161216, while the sum is 48.

The spelling of 21226974834 in words is "twenty-one billion, two hundred twenty-six million, nine hundred seventy-four thousand, eight hundred thirty-four".