21102351 has 8 divisors (see below), whose sum is σ = 29044224. Its totient is φ = 13614360.

The previous prime is 21102313. The next prime is 21102377. The reversal of 21102351 is 15320112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21102351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21102351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102311) 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, 113361 + ... + 113546.

It is an arithmetic number, because the mean of its divisors is an integer number (3630528).

Almost surely, 2^21102351 is an apocalyptic number.

21102351 is a deficient number, since it is larger than the sum of its proper divisors (7941873).

21102351 is a wasteful number, since it uses less digits than its factorization.

21102351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226941.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 21102351 is about 4593.7295305666. The cubic root of 21102351 is about 276.3399114934.

Adding to 21102351 its reverse (15320112), we get a palindrome (36422463).

The spelling of 21102351 in words is "twenty-one million, one hundred two thousand, three hundred fifty-one".