21760542 has 32 divisors (see below), whose sum is σ = 48813600. Its totient is φ = 7185024.

The previous prime is 21760517. The next prime is 21760547. The reversal of 21760542 is 24506712.

21760542 is a `hidden beast` number, since 2 + 17 + 605 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21760547) 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, 4038 + ... + 7734.

It is an arithmetic number, because the mean of its divisors is an integer number (1525425).

Almost surely, 2^21760542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21760542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24406800).

21760542 is an abundant number, since it is smaller than the sum of its proper divisors (27053058).

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

21760542 is a wasteful number, since it uses less digits than its factorization.

21760542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3817 (or 3811 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 21760542 is about 4664.8196106602. The cubic root of 21760542 is about 279.1835998144.

The spelling of 21760542 in words is "twenty-one million, seven hundred sixty thousand, five hundred forty-two".