21470590 has 8 divisors (see below), whose sum is σ = 38647080. Its totient is φ = 8588232.

The previous prime is 21470567. The next prime is 21470591. The reversal of 21470590 is 9507412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073520 + ... + 1073539.

It is an arithmetic number, because the mean of its divisors is an integer number (4830885).

Almost surely, 2^21470590 is an apocalyptic number.

21470590 is a deficient number, since it is larger than the sum of its proper divisors (17176490).

21470590 is a wasteful number, since it uses less digits than its factorization.

21470590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2147066.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 21470590 is about 4633.6368006135. The cubic root of 21470590 is about 277.9380415033.

The spelling of 21470590 in words is "twenty-one million, four hundred seventy thousand, five hundred ninety".