721421212 has 12 divisors (see below), whose sum is σ = 1303212736. Its totient is φ = 349074720.

The previous prime is 721421179. The next prime is 721421221. The reversal of 721421212 is 212124127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2908833 + ... + 2909080.

Almost surely, 2^721421212 is an apocalyptic number.

It is an amenable number.

721421212 is a deficient number, since it is larger than the sum of its proper divisors (581791524).

721421212 is a wasteful number, since it uses less digits than its factorization.

721421212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5817948 (or 5817946 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 721421212 is about 26859.2853963020. The cubic root of 721421212 is about 896.8702863645.

Adding to 721421212 its reverse (212124127), we get a palindrome (933545339).

The spelling of 721421212 in words is "seven hundred twenty-one million, four hundred twenty-one thousand, two hundred twelve".