21701946 has 16 divisors (see below), whose sum is σ = 49604544. Its totient is φ = 6200544.

The previous prime is 21701941. The next prime is 21701959. The reversal of 21701946 is 64910712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21701941) 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, 258315 + ... + 258398.

It is an arithmetic number, because the mean of its divisors is an integer number (3100284).

Almost surely, 2^21701946 is an apocalyptic number.

21701946 is an abundant number, since it is smaller than the sum of its proper divisors (27902598).

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

21701946 is a wasteful number, since it uses less digits than its factorization.

21701946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516725.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 21701946 is about 4658.5347481799. The cubic root of 21701946 is about 278.9327827178.

The spelling of 21701946 in words is "twenty-one million, seven hundred one thousand, nine hundred forty-six".