21470946 has 16 divisors (see below), whose sum is σ = 49076544. Its totient is φ = 6134544.

The previous prime is 21470923. The next prime is 21470947. The reversal of 21470946 is 64907412.

It is a happy number.

It is a super-2 number, since 2×21470946² = 922003044269832, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21470947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255565 + ... + 255648.

It is an arithmetic number, because the mean of its divisors is an integer number (3067284).

Almost surely, 2^21470946 is an apocalyptic number.

21470946 is an abundant number, since it is smaller than the sum of its proper divisors (27605598).

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

21470946 is a wasteful number, since it uses less digits than its factorization.

21470946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511225.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21470946 is about 4633.6752152044. The cubic root of 21470946 is about 277.9395776418.

The spelling of 21470946 in words is "twenty-one million, four hundred seventy thousand, nine hundred forty-six".