21100010 has 8 divisors (see below), whose sum is σ = 37980036. Its totient is φ = 8440000.

The previous prime is 21100007. The next prime is 21100019. The reversal of 21100010 is 1000112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19509889 + 1590121 = 4417^2 + 1261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a junction number, because it is equal to n+sod(n) for n = 21099967 and 21100003.

It is not an unprimeable number, because it can be changed into a prime (21100019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1054991 + ... + 1055010.

Almost surely, 2^21100010 is an apocalyptic number.

21100010 is a deficient number, since it is larger than the sum of its proper divisors (16880026).

21100010 is a wasteful number, since it uses less digits than its factorization.

21100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110008.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 21100010 is about 4593.4747196431. The cubic root of 21100010 is about 276.3296924794.

Adding to 21100010 its reverse (1000112), we get a palindrome (22100122).

The spelling of 21100010 in words is "twenty-one million, one hundred thousand, ten".