721022252 has 6 divisors (see below), whose sum is σ = 1261788948. Its totient is φ = 360511124.

The previous prime is 721022251. The next prime is 721022287. The reversal of 721022252 is 252220127.

It is not an unprimeable number, because it can be changed into a prime (721022251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90127778 + ... + 90127785.

It is an arithmetic number, because the mean of its divisors is an integer number (210298158).

Almost surely, 2^721022252 is an apocalyptic number.

It is an amenable number.

721022252 is a deficient number, since it is larger than the sum of its proper divisors (540766696).

721022252 is a wasteful number, since it uses less digits than its factorization.

721022252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180255567 (or 180255565 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 721022252 is about 26851.8575148908. The cubic root of 721022252 is about 896.7049269585.

Adding to 721022252 its reverse (252220127), we get a palindrome (973242379).

The spelling of 721022252 in words is "seven hundred twenty-one million, twenty-two thousand, two hundred fifty-two".