21052970 has 32 divisors (see below), whose sum is σ = 40824000. Its totient is φ = 7787776.

The previous prime is 21052957. The next prime is 21052973. The reversal of 21052970 is 7925012.

It is not an unprimeable number, because it can be changed into a prime (21052973) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8981 + ... + 11079.

It is an arithmetic number, because the mean of its divisors is an integer number (1275750).

Almost surely, 2^21052970 is an apocalyptic number.

21052970 is a deficient number, since it is larger than the sum of its proper divisors (19771030).

21052970 is a wasteful number, since it uses less digits than its factorization.

21052970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 21052970 is about 4588.3515558423. The cubic root of 21052970 is about 276.1241914663.

Adding to 21052970 its reverse (7925012), we get a palindrome (28977982).

It can be divided in two parts, 21052 and 970, that added together give a palindrome (22022).

The spelling of 21052970 in words is "twenty-one million, fifty-two thousand, nine hundred seventy".