21246470 has 32 divisors (see below), whose sum is σ = 45121536. Its totient is φ = 7048800.

The previous prime is 21246469. The next prime is 21246479. The reversal of 21246470 is 7464212.

21246470 = 28² + 29² + ... + 399².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246479) 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, 2726 + ... + 7065.

It is an arithmetic number, because the mean of its divisors is an integer number (1410048).

Almost surely, 2^21246470 is an apocalyptic number.

21246470 is an abundant number, since it is smaller than the sum of its proper divisors (23875066).

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

21246470 is a wasteful number, since it uses less digits than its factorization.

21246470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9836.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 21246470 is about 4609.3893304862. The cubic root of 21246470 is about 276.9675747385.

The spelling of 21246470 in words is "twenty-one million, two hundred forty-six thousand, four hundred seventy".