21102707 has 8 divisors (see below), whose sum is σ = 22394880. Its totient is φ = 19841800.

The previous prime is 21102677. The next prime is 21102709. The reversal of 21102707 is 70720112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21102707 - 2⁶ = 21102643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102709) 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, 6419 + ... + 9132.

It is an arithmetic number, because the mean of its divisors is an integer number (2799360).

Almost surely, 2^21102707 is an apocalyptic number.

21102707 is a deficient number, since it is larger than the sum of its proper divisors (1292173).

21102707 is a wasteful number, since it uses less digits than its factorization.

21102707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15633.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 21102707 is about 4593.7682788752. The cubic root of 21102707 is about 276.3414654506.

Adding to 21102707 its reverse (70720112), we get a palindrome (91822819).

The spelling of 21102707 in words is "twenty-one million, one hundred two thousand, seven hundred seven".