21237070 has 8 divisors (see below), whose sum is σ = 38226744. Its totient is φ = 8494824.

The previous prime is 21237043. The next prime is 21237071. The reversal of 21237070 is 7073212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21237071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061844 + ... + 1061863.

It is an arithmetic number, because the mean of its divisors is an integer number (4778343).

Almost surely, 2^21237070 is an apocalyptic number.

21237070 is a deficient number, since it is larger than the sum of its proper divisors (16989674).

21237070 is a wasteful number, since it uses less digits than its factorization.

21237070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123714.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 21237070 is about 4608.3695598335. The cubic root of 21237070 is about 276.9267227875.

The spelling of 21237070 in words is "twenty-one million, two hundred thirty-seven thousand, seventy".