21772794 has 16 divisors (see below), whose sum is σ = 45047520. Its totient is φ = 7007280.

The previous prime is 21772787. The next prime is 21772811. The reversal of 21772794 is 49727712.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62392 + ... + 62739.

It is an arithmetic number, because the mean of its divisors is an integer number (2815470).

Almost surely, 2^21772794 is an apocalyptic number.

21772794 is an abundant number, since it is smaller than the sum of its proper divisors (23274726).

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

21772794 is a wasteful number, since it uses less digits than its factorization.

21772794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125165.

The product of its digits is 49392, while the sum is 39.

The square root of 21772794 is about 4666.1326599230. The cubic root of 21772794 is about 279.2359869241.

The spelling of 21772794 in words is "twenty-one million, seven hundred seventy-two thousand, seven hundred ninety-four".