21034342 has 16 divisors (see below), whose sum is σ = 36129312. Its totient is φ = 8997120.

The previous prime is 21034331. The next prime is 21034357. The reversal of 21034342 is 24343012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8118 + ... + 10390.

It is an arithmetic number, because the mean of its divisors is an integer number (2258082).

Almost surely, 2^21034342 is an apocalyptic number.

21034342 is a deficient number, since it is larger than the sum of its proper divisors (15094970).

21034342 is a wasteful number, since it uses less digits than its factorization.

21034342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21034342 is about 4586.3211836940. The cubic root of 21034342 is about 276.0427277545.

Adding to 21034342 its reverse (24343012), we get a palindrome (45377354).

The spelling of 21034342 in words is "twenty-one million, thirty-four thousand, three hundred forty-two".