21103350 has 24 divisors (see below), whose sum is σ = 52336680. Its totient is φ = 5627520.

The previous prime is 21103339. The next prime is 21103363. The reversal of 21103350 is 5330112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70195 + ... + 70494.

It is an arithmetic number, because the mean of its divisors is an integer number (2180695).

Almost surely, 2^21103350 is an apocalyptic number.

21103350 is an abundant number, since it is smaller than the sum of its proper divisors (31233330).

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

21103350 is a wasteful number, since it uses less digits than its factorization.

21103350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140704 (or 140699 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 21103350 is about 4593.8382644582. The cubic root of 21103350 is about 276.3442721325.

Adding to 21103350 its reverse (5330112), we get a palindrome (26433462).

It can be divided in two parts, 2110 and 3350, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 21103350 in words is "twenty-one million, one hundred three thousand, three hundred fifty".