21115070 has 8 divisors (see below), whose sum is σ = 38007144. Its totient is φ = 8446024.

The previous prime is 21115063. The next prime is 21115091. The reversal of 21115070 is 7051112.

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

It is a super-2 number, since 2×21115070² = 891692362209800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055744 + ... + 1055763.

It is an arithmetic number, because the mean of its divisors is an integer number (4750893).

Almost surely, 2^21115070 is an apocalyptic number.

21115070 is a deficient number, since it is larger than the sum of its proper divisors (16892074).

21115070 is a wasteful number, since it uses less digits than its factorization.

21115070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111514.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 21115070 is about 4595.1137091480. The cubic root of 21115070 is about 276.3954197069.

Adding to 21115070 its reverse (7051112), we get a palindrome (28166182).

The spelling of 21115070 in words is "twenty-one million, one hundred fifteen thousand, seventy".