21121010 has 16 divisors (see below), whose sum is σ = 38477376. Its totient is φ = 8346288.

The previous prime is 21121003. The next prime is 21121033. The reversal of 21121010 is 1012112.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11894 + ... + 13553.

It is an arithmetic number, because the mean of its divisors is an integer number (2404836).

Almost surely, 2^21121010 is an apocalyptic number.

21121010 is a deficient number, since it is larger than the sum of its proper divisors (17356366).

21121010 is a wasteful number, since it uses less digits than its factorization.

21121010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25537.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 21121010 is about 4595.7600024370. The cubic root of 21121010 is about 276.4213353975.

Adding to 21121010 its reverse (1012112), we get a palindrome (22133122).

The spelling of 21121010 in words is "twenty-one million, one hundred twenty-one thousand, ten".