21470277 has 16 divisors (see below), whose sum is σ = 29424960. Its totient is φ = 13920000.

The previous prime is 21470261. The next prime is 21470279. The reversal of 21470277 is 77207412.

It is not a de Polignac number, because 21470277 - 2⁴ = 21470261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470279) 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, 17277 + ... + 18477.

It is an arithmetic number, because the mean of its divisors is an integer number (1839060).

Almost surely, 2^21470277 is an apocalyptic number.

It is an amenable number.

21470277 is a deficient number, since it is larger than the sum of its proper divisors (7954683).

21470277 is a wasteful number, since it uses less digits than its factorization.

21470277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364.

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

The square root of 21470277 is about 4633.6030257242. The cubic root of 21470277 is about 277.9366908957.

Adding to 21470277 its reverse (77207412), we get a palindrome (98677689).

The spelling of 21470277 in words is "twenty-one million, four hundred seventy thousand, two hundred seventy-seven".