21248670 has 32 divisors (see below), whose sum is σ = 51200928. Its totient is φ = 5643648.

The previous prime is 21248663. The next prime is 21248687. The reversal of 21248670 is 7684212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

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, 7032 + ... + 9588.

It is an arithmetic number, because the mean of its divisors is an integer number (1600029).

Almost surely, 2^21248670 is an apocalyptic number.

21248670 is an abundant number, since it is smaller than the sum of its proper divisors (29952258).

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

21248670 is a wasteful number, since it uses less digits than its factorization.

21248670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2844.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 21248670 is about 4609.6279676347. The cubic root of 21248670 is about 276.9771340933.

The spelling of 21248670 in words is "twenty-one million, two hundred forty-eight thousand, six hundred seventy".