21761342 has 4 divisors (see below), whose sum is σ = 32642016. Its totient is φ = 10880670.

The previous prime is 21761303. The next prime is 21761347. The reversal of 21761342 is 24316712.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21761347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5440334 + ... + 5440337.

It is an arithmetic number, because the mean of its divisors is an integer number (8160504).

Almost surely, 2^21761342 is an apocalyptic number.

21761342 is a deficient number, since it is larger than the sum of its proper divisors (10880674).

21761342 is a wasteful number, since it uses less digits than its factorization.

21761342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10880673.

The product of its digits is 2016, while the sum is 26.

The square root of 21761342 is about 4664.9053580968. The cubic root of 21761342 is about 279.1870210549.

The spelling of 21761342 in words is "twenty-one million, seven hundred sixty-one thousand, three hundred forty-two".