21695060 has 24 divisors (see below), whose sum is σ = 48240360. Its totient is φ = 8167424.

The previous prime is 21695057. The next prime is 21695081. The reversal of 21695060 is 6059612.

It can be written as a sum of positive squares in 4 ways, for example, as 276676 + 21418384 = 526^2 + 4628^2 .

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, 31565 + ... + 32244.

It is an arithmetic number, because the mean of its divisors is an integer number (2010015).

Almost surely, 2^21695060 is an apocalyptic number.

21695060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21695060 is an abundant number, since it is smaller than the sum of its proper divisors (26545300).

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

21695060 is a wasteful number, since it uses less digits than its factorization.

21695060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63835 (or 63833 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 21695060 is about 4657.7956159540. The cubic root of 21695060 is about 278.9032779240.

The spelling of 21695060 in words is "twenty-one million, six hundred ninety-five thousand, sixty".