21553102 has 4 divisors (see below), whose sum is σ = 32329656. Its totient is φ = 10776550.

The previous prime is 21553099. The next prime is 21553111. The reversal of 21553102 is 20135512.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21553102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5388274 + ... + 5388277.

It is an arithmetic number, because the mean of its divisors is an integer number (8082414).

Almost surely, 2^21553102 is an apocalyptic number.

21553102 is a deficient number, since it is larger than the sum of its proper divisors (10776554).

21553102 is a wasteful number, since it uses less digits than its factorization.

21553102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10776553.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 21553102 is about 4642.5318523409. The cubic root of 21553102 is about 278.2936272697.

Adding to 21553102 its reverse (20135512), we get a palindrome (41688614).

The spelling of 21553102 in words is "twenty-one million, five hundred fifty-three thousand, one hundred two".