21774270 has 32 divisors (see below), whose sum is σ = 59724288. Its totient is φ = 4976928.

The previous prime is 21774253. The next prime is 21774281. The reversal of 21774270 is 7247712.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51634 + ... + 52053.

It is an arithmetic number, because the mean of its divisors is an integer number (1866384).

Almost surely, 2^21774270 is an apocalyptic number.

21774270 is an abundant number, since it is smaller than the sum of its proper divisors (37950018).

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

21774270 is a wasteful number, since it uses less digits than its factorization.

21774270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103704.

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 21774270 is about 4666.2908181981. The cubic root of 21774270 is about 279.2422966793.

The spelling of 21774270 in words is "twenty-one million, seven hundred seventy-four thousand, two hundred seventy".