21552349 has 16 divisors (see below), whose sum is σ = 26707072. Its totient is φ = 16936128.

The previous prime is 21552341. The next prime is 21552353. The reversal of 21552349 is 94325512.

It is a cyclic number.

It is not a de Polignac number, because 21552349 - 2³ = 21552341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21552349.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14107 + ... + 15559.

It is an arithmetic number, because the mean of its divisors is an integer number (1669192).

Almost surely, 2^21552349 is an apocalyptic number.

It is an amenable number.

21552349 is a deficient number, since it is larger than the sum of its proper divisors (5154723).

21552349 is a wasteful number, since it uses less digits than its factorization.

21552349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636.

The product of its digits is 10800, while the sum is 31.

The square root of 21552349 is about 4642.4507536430. The cubic root of 21552349 is about 278.2903863202.

It can be divided in two parts, 2155234 and 9, that multiplied together give a triangular number (19397106 = T₆₂₂₈).

The spelling of 21552349 in words is "twenty-one million, five hundred fifty-two thousand, three hundred forty-nine".