721420202 has 16 divisors (see below), whose sum is σ = 1130861952. Its totient is φ = 344823360.

The previous prime is 721420201. The next prime is 721420261. The reversal of 721420202 is 202024127.

It is a happy number.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (721420201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85199 + ... + 93282.

It is an arithmetic number, because the mean of its divisors is an integer number (70678872).

Almost surely, 2^721420202 is an apocalyptic number.

721420202 is a deficient number, since it is larger than the sum of its proper divisors (409441750).

721420202 is a wasteful number, since it uses less digits than its factorization.

721420202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178573.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 721420202 is about 26859.2665946038. The cubic root of 721420202 is about 896.8698678206.

Adding to 721420202 its reverse (202024127), we get a palindrome (923444329).

The spelling of 721420202 in words is "seven hundred twenty-one million, four hundred twenty thousand, two hundred two".