21912412074 has 64 divisors (see below), whose sum is σ = 52792335360. Its totient is φ = 5923221120.

The previous prime is 21912412043. The next prime is 21912412091. The reversal of 21912412074 is 47021421912.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 589237 + ... + 625319.

It is an arithmetic number, because the mean of its divisors is an integer number (824880240).

Almost surely, 2^21912412074 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21912412074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26396167680).

21912412074 is an abundant number, since it is smaller than the sum of its proper divisors (30879923286).

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

21912412074 is a wasteful number, since it uses less digits than its factorization.

21912412074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36875.

The product of its (nonzero) digits is 8064, while the sum is 33.

Adding to 21912412074 its reverse (47021421912), we get a palindrome (68933833986).

The spelling of 21912412074 in words is "twenty-one billion, nine hundred twelve million, four hundred twelve thousand, seventy-four".