21774420694 has 36 divisors (see below), whose sum is σ = 35834114988. Its totient is φ = 9917381760.

The previous prime is 21774420691. The next prime is 21774420749. The reversal of 21774420694 is 49602447712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21774420691) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24715134 + ... + 24716014.

It is an arithmetic number, because the mean of its divisors is an integer number (995392083).

Almost surely, 2^21774420694 is an apocalyptic number.

21774420694 is a deficient number, since it is larger than the sum of its proper divisors (14059694294).

21774420694 is an frugal number, since it uses more digits than its factorization.

21774420694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873 (or 979 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 46.

The spelling of 21774420694 in words is "twenty-one billion, seven hundred seventy-four million, four hundred twenty thousand, six hundred ninety-four".