21070460 has 24 divisors (see below), whose sum is σ = 44466576. Its totient is φ = 8386560.

The previous prime is 21070447. The next prime is 21070477. The reversal of 21070460 is 6407012.

It is a super-2 number, since 2×21070460² = 887928569223200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1724 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (1852774).

Almost surely, 2^21070460 is an apocalyptic number.

21070460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21070460 is an abundant number, since it is smaller than the sum of its proper divisors (23396116).

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

21070460 is a wasteful number, since it uses less digits than its factorization.

21070460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5213 (or 5211 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21070460 is about 4590.2570734110. The cubic root of 21070460 is about 276.2006347640.

Adding to 21070460 its reverse (6407012), we get a palindrome (27477472).

The spelling of 21070460 in words is "twenty-one million, seventy thousand, four hundred sixty".