247021402 has 4 divisors (see below), whose sum is σ = 370532106. Its totient is φ = 123510700.

The previous prime is 247021381. The next prime is 247021417. The reversal of 247021402 is 204120742.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 208196041 + 38825361 = 14429^2 + 6231^2 .

It is a super-2 number, since 2×247021402² = 122039146092091208, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61755349 + ... + 61755352.

Almost surely, 2^247021402 is an apocalyptic number.

247021402 is a deficient number, since it is larger than the sum of its proper divisors (123510704).

247021402 is a wasteful number, since it uses less digits than its factorization.

247021402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123510703.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 247021402 is about 15716.9145190778. The cubic root of 247021402 is about 627.4486570373.

The spelling of 247021402 in words is "two hundred forty-seven million, twenty-one thousand, four hundred two".