21140675 has 12 divisors (see below), whose sum is σ = 26300400. Its totient is φ = 16857120.

The previous prime is 21140663. The next prime is 21140677. The reversal of 21140675 is 57604112.

It is not a de Polignac number, because 21140675 - 2¹² = 21136579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21140677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7514 + ... + 9936.

It is an arithmetic number, because the mean of its divisors is an integer number (2191700).

Almost surely, 2^21140675 is an apocalyptic number.

21140675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21140675 is a deficient number, since it is larger than the sum of its proper divisors (5159725).

21140675 is a wasteful number, since it uses less digits than its factorization.

21140675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782 (or 2777 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21140675 is about 4597.8989767066. The cubic root of 21140675 is about 276.5070973853.

Adding to 21140675 its reverse (57604112), we get a palindrome (78744787).

The spelling of 21140675 in words is "twenty-one million, one hundred forty thousand, six hundred seventy-five".