34207821 has 12 divisors (see below), whose sum is σ = 49525372. Its totient is φ = 22752576.

The previous prime is 34207819. The next prime is 34207837. The reversal of 34207821 is 12870243.

It can be written as a sum of positive squares in 2 ways, for example, as 32046921 + 2160900 = 5661^2 + 1470^2 .

It is not a de Polignac number, because 34207821 - 2¹ = 34207819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (34207841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46 + ... + 8271.

Almost surely, 2^34207821 is an apocalyptic number.

It is an amenable number.

34207821 is a deficient number, since it is larger than the sum of its proper divisors (15317551).

34207821 is a wasteful number, since it uses less digits than its factorization.

34207821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8780 (or 8777 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 34207821 is about 5848.7452500515. The cubic root of 34207821 is about 324.6198980334.

The spelling of 34207821 in words is "thirty-four million, two hundred seven thousand, eight hundred twenty-one".