21011210 has 32 divisors (see below), whose sum is σ = 41477184. Its totient is φ = 7600000.

The previous prime is 21011191. The next prime is 21011231. The reversal of 21011210 is 1211012.

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, 27230 + ... + 27990.

It is an arithmetic number, because the mean of its divisors is an integer number (1296162).

Almost surely, 2^21011210 is an apocalyptic number.

21011210 is a deficient number, since it is larger than the sum of its proper divisors (20465974).

21011210 is a wasteful number, since it uses less digits than its factorization.

21011210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1030.

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

The square root of 21011210 is about 4583.7986430471. The cubic root of 21011210 is about 275.9415002389.

Adding to 21011210 its reverse (1211012), we get a palindrome (22222222).

The spelling of 21011210 in words is "twenty-one million, eleven thousand, two hundred ten".