21470570 has 32 divisors (see below), whose sum is σ = 44383680. Its totient is φ = 7395840.

The previous prime is 21470567. The next prime is 21470591. The reversal of 21470570 is 7507412.

It is a super-2 number, since 2×21470570² = 921970752249800, which contains 22 as substring.

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, 3047 + ... + 7226.

It is an arithmetic number, because the mean of its divisors is an integer number (1386990).

Almost surely, 2^21470570 is an apocalyptic number.

21470570 is an abundant number, since it is smaller than the sum of its proper divisors (22913110).

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

21470570 is a wasteful number, since it uses less digits than its factorization.

21470570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10310.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 21470570 is about 4633.6346424810. The cubic root of 21470570 is about 277.9379552029.

Adding to 21470570 its reverse (7507412), we get a palindrome (28977982).

The spelling of 21470570 in words is "twenty-one million, four hundred seventy thousand, five hundred seventy".