21126710 has 32 divisors (see below), whose sum is σ = 41796000. Its totient is φ = 7624960.

The previous prime is 21126709. The next prime is 21126739. The reversal of 21126710 is 1762112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15746 + ... + 17034.

It is an arithmetic number, because the mean of its divisors is an integer number (1306125).

Almost surely, 2^21126710 is an apocalyptic number.

21126710 is a deficient number, since it is larger than the sum of its proper divisors (20669290).

21126710 is a wasteful number, since it uses less digits than its factorization.

21126710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21126710 is about 4596.3800974245. The cubic root of 21126710 is about 276.4461994215.

Adding to 21126710 its reverse (1762112), we get a palindrome (22888822).

The spelling of 21126710 in words is "twenty-one million, one hundred twenty-six thousand, seven hundred ten".