21347012 has 6 divisors (see below), whose sum is σ = 37357278. Its totient is φ = 10673504.

The previous prime is 21346993. The next prime is 21347017. The reversal of 21347012 is 21074312.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 1401856 = 4466^2 + 1184^2 .

It is not an unprimeable number, because it can be changed into a prime (21347017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2668373 + ... + 2668380.

It is an arithmetic number, because the mean of its divisors is an integer number (6226213).

Almost surely, 2^21347012 is an apocalyptic number.

It is an amenable number.

21347012 is a deficient number, since it is larger than the sum of its proper divisors (16010266).

21347012 is a wasteful number, since it uses less digits than its factorization.

21347012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5336757 (or 5336755 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21347012 is about 4620.2826753349. The cubic root of 21347012 is about 277.4037736866.

The spelling of 21347012 in words is "twenty-one million, three hundred forty-seven thousand, twelve".