21611010 has 16 divisors (see below), whose sum is σ = 51866496. Its totient is φ = 5762928.

The previous prime is 21610991. The next prime is 21611011. The reversal of 21611010 is 1011612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21611011) 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, 360154 + ... + 360213.

It is an arithmetic number, because the mean of its divisors is an integer number (3241656).

Almost surely, 2^21611010 is an apocalyptic number.

21611010 is an abundant number, since it is smaller than the sum of its proper divisors (30255486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21611010 is a wasteful number, since it uses less digits than its factorization.

21611010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720377.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 21611010 is about 4648.7643519542. The cubic root of 21611010 is about 278.5426403988.

Adding to 21611010 its reverse (1011612), we get a palindrome (22622622).

The spelling of 21611010 in words is "twenty-one million, six hundred eleven thousand, ten".