21347052 has 12 divisors (see below), whose sum is σ = 49809816. Its totient is φ = 7115680.

The previous prime is 21347047. The next prime is 21347069. The reversal of 21347052 is 25074312.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21347052³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 889449 + ... + 889472.

It is an arithmetic number, because the mean of its divisors is an integer number (4150818).

Almost surely, 2^21347052 is an apocalyptic number.

It is an amenable number.

21347052 is an abundant number, since it is smaller than the sum of its proper divisors (28462764).

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

21347052 is a wasteful number, since it uses less digits than its factorization.

21347052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778928 (or 1778926 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21347052 is about 4620.2870040724. The cubic root of 21347052 is about 277.4039469527.

The spelling of 21347052 in words is "twenty-one million, three hundred forty-seven thousand, fifty-two".