21970403 has 32 divisors (see below), whose sum is σ = 28976640. Its totient is φ = 16174080.

The previous prime is 21970397. The next prime is 21970427. The reversal of 21970403 is 30407912.

It is not a de Polignac number, because 21970403 - 2⁴ = 21970387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21970433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167648 + ... + 167778.

It is an arithmetic number, because the mean of its divisors is an integer number (905520).

Almost surely, 2^21970403 is an apocalyptic number.

21970403 is a deficient number, since it is larger than the sum of its proper divisors (7006237).

21970403 is a wasteful number, since it uses less digits than its factorization.

21970403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21970403 is about 4687.2596471713. The cubic root of 21970403 is about 280.0782221930.

The spelling of 21970403 in words is "twenty-one million, nine hundred seventy thousand, four hundred three".