21113670 has 16 divisors (see below), whose sum is σ = 50672880. Its totient is φ = 5630304.

The previous prime is 21113639. The next prime is 21113671. The reversal of 21113670 is 7631112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113671) 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, 351865 + ... + 351924.

It is an arithmetic number, because the mean of its divisors is an integer number (3167055).

Almost surely, 2^21113670 is an apocalyptic number.

21113670 is an abundant number, since it is smaller than the sum of its proper divisors (29559210).

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

21113670 is a wasteful number, since it uses less digits than its factorization.

21113670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703799.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21113670 is about 4594.9613708931. The cubic root of 21113670 is about 276.3893109240.

Adding to 21113670 its reverse (7631112), we get a palindrome (28744782).

The spelling of 21113670 in words is "twenty-one million, one hundred thirteen thousand, six hundred seventy".