21185065722 has 32 divisors (see below), whose sum is σ = 44456630400. Its totient is φ = 6717332160.

The previous prime is 21185065673. The next prime is 21185065723. The reversal of 21185065722 is 22756058112.

It is not an unprimeable number, because it can be changed into a prime (21185065723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399097 + ... + 449052.

It is an arithmetic number, because the mean of its divisors is an integer number (1389269700).

Almost surely, 2^21185065722 is an apocalyptic number.

21185065722 is an abundant number, since it is smaller than the sum of its proper divisors (23271564678).

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

21185065722 is a wasteful number, since it uses less digits than its factorization.

21185065722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848358.

The product of its (nonzero) digits is 67200, while the sum is 39.

The spelling of 21185065722 in words is "twenty-one billion, one hundred eighty-five million, sixty-five thousand, seven hundred twenty-two".