21277146 has 32 divisors (see below), whose sum is σ = 47683008. Its totient is φ = 6272640.

The previous prime is 21277121. The next prime is 21277153. The reversal of 21277146 is 64177212.

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, 1915 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (1490094).

Almost surely, 2^21277146 is an apocalyptic number.

21277146 is an abundant number, since it is smaller than the sum of its proper divisors (26405862).

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

21277146 is a wasteful number, since it uses less digits than its factorization.

21277146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8766.

The product of its digits is 4704, while the sum is 30.

The square root of 21277146 is about 4612.7156860140. The cubic root of 21277146 is about 277.1008074055.

The spelling of 21277146 in words is "twenty-one million, two hundred seventy-seven thousand, one hundred forty-six".