21485937 has 16 divisors (see below), whose sum is σ = 32098752. Its totient is φ = 12669120.

The previous prime is 21485929. The next prime is 21485957. The reversal of 21485937 is 73958412.

It is not a de Polignac number, because 21485937 - 2³ = 21485929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21485895 and 21485904.

It is not an unprimeable number, because it can be changed into a prime (21485957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7578 + ... + 10019.

It is an arithmetic number, because the mean of its divisors is an integer number (2006172).

Almost surely, 2^21485937 is an apocalyptic number.

It is an amenable number.

21485937 is a deficient number, since it is larger than the sum of its proper divisors (10612815).

21485937 is a wasteful number, since it uses less digits than its factorization.

21485937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17648.

The product of its digits is 60480, while the sum is 39.

The square root of 21485937 is about 4635.2925474019. The cubic root of 21485937 is about 278.0042483349.

It can be divided in two parts, 21485 and 937, that added together give a palindrome (22422).

The spelling of 21485937 in words is "twenty-one million, four hundred eighty-five thousand, nine hundred thirty-seven".