21237046 has 16 divisors (see below), whose sum is σ = 34819200. Its totient is φ = 9671040.

The previous prime is 21237043. The next prime is 21237071. The reversal of 21237046 is 64073212.

It is a super-2 number, since 2×21237046² = 902024245612232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21237046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21237043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9021 + ... + 11128.

It is an arithmetic number, because the mean of its divisors is an integer number (2176200).

Almost surely, 2^21237046 is an apocalyptic number.

21237046 is a deficient number, since it is larger than the sum of its proper divisors (13582154).

21237046 is a wasteful number, since it uses less digits than its factorization.

21237046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20199.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21237046 is about 4608.3669558749. The cubic root of 21237046 is about 276.9266184693.

The spelling of 21237046 in words is "twenty-one million, two hundred thirty-seven thousand, forty-six".