1072200721 has 4 divisors (see below), whose sum is σ = 1089777844. Its totient is φ = 1054623600.

The previous prime is 1072200697. The next prime is 1072200737. The reversal of 1072200721 is 1270022701.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44036496 + 1028164225 = 6636^2 + 32065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1072200721 is a prime.

It is a super-2 number, since 2×1072200721² = 2299228772225839682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1072200692 and 1072200701.

It is not an unprimeable number, because it can be changed into a prime (1072200791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8788470 + ... + 8788591.

It is an arithmetic number, because the mean of its divisors is an integer number (272444461).

Almost surely, 2^1072200721 is an apocalyptic number.

It is an amenable number.

1072200721 is a deficient number, since it is larger than the sum of its proper divisors (17577123).

1072200721 is an equidigital number, since it uses as much as digits as its factorization.

1072200721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17577122.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 1072200721 is about 32744.4761906493. The cubic root of 1072200721 is about 1023.5098619827.

The spelling of 1072200721 in words is "one billion, seventy-two million, two hundred thousand, seven hundred twenty-one".