21552741 has 12 divisors (see below), whose sum is σ = 35579232. Its totient is φ = 12315816.

The previous prime is 21552737. The next prime is 21552767. The reversal of 21552741 is 14725512.

It is not a de Polignac number, because 21552741 - 2² = 21552737 is a prime.

It is a super-2 number, since 2×21552741² = 929041289226162, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 170991 + ... + 171116.

It is an arithmetic number, because the mean of its divisors is an integer number (2964936).

Almost surely, 2^21552741 is an apocalyptic number.

21552741 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21552741 is a deficient number, since it is larger than the sum of its proper divisors (14026491).

21552741 is a wasteful number, since it uses less digits than its factorization.

21552741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342120 (or 342117 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 21552741 is about 4642.4929725310. The cubic root of 21552741 is about 278.2920735171.

The spelling of 21552741 in words is "twenty-one million, five hundred fifty-two thousand, seven hundred forty-one".