21102010 has 16 divisors (see below), whose sum is σ = 39209472. Its totient is φ = 8168400.

The previous prime is 21101963. The next prime is 21102023. The reversal of 21102010 is 1020112.

It is a junction number, because it is equal to n+sod(n) for n = 21101984 and 21102002.

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, 33726 + ... + 34345.

It is an arithmetic number, because the mean of its divisors is an integer number (2450592).

Almost surely, 2^21102010 is an apocalyptic number.

21102010 is a deficient number, since it is larger than the sum of its proper divisors (18107462).

21102010 is a wasteful number, since it uses less digits than its factorization.

21102010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68109.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 21102010 is about 4593.6924146051. The cubic root of 21102010 is about 276.3384229954.

Adding to 21102010 its reverse (1020112), we get a palindrome (22122122).

The spelling of 21102010 in words is "twenty-one million, one hundred two thousand, ten".