21120770 has 16 divisors (see below), whose sum is σ = 41473728. Its totient is φ = 7680240.

The previous prime is 21120769. The next prime is 21120773. The reversal of 21120770 is 7702112.

It is not an unprimeable number, because it can be changed into a prime (21120773) 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, 95894 + ... + 96113.

It is an arithmetic number, because the mean of its divisors is an integer number (2592108).

Almost surely, 2^21120770 is an apocalyptic number.

21120770 is a deficient number, since it is larger than the sum of its proper divisors (20352958).

21120770 is a wasteful number, since it uses less digits than its factorization.

21120770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192025.

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

The square root of 21120770 is about 4595.7338913388. The cubic root of 21120770 is about 276.4202883931.

Adding to 21120770 its reverse (7702112), we get a palindrome (28822882).

The spelling of 21120770 in words is "twenty-one million, one hundred twenty thousand, seven hundred seventy".