21131060 has 24 divisors (see below), whose sum is σ = 45409056. Its totient is φ = 8255520.

The previous prime is 21131041. The next prime is 21131069. The reversal of 21131060 is 6013112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131069) 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, 11426 + ... + 13145.

It is an arithmetic number, because the mean of its divisors is an integer number (1892044).

Almost surely, 2^21131060 is an apocalyptic number.

21131060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131060 is an abundant number, since it is smaller than the sum of its proper divisors (24277996).

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

21131060 is a wasteful number, since it uses less digits than its factorization.

21131060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24623 (or 24621 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21131060 is about 4596.8532715326. The cubic root of 21131060 is about 276.4651715890.

Adding to 21131060 its reverse (6013112), we get a palindrome (27144172).

The spelling of 21131060 in words is "twenty-one million, one hundred thirty-one thousand, sixty".