772012021 has 4 divisors (see below), whose sum is σ = 842194944. Its totient is φ = 701829100.

The previous prime is 772011959. The next prime is 772012057. The reversal of 772012021 is 120210277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120210277 = 11 ⋅10928207.

It is a cyclic number.

It is not a de Polignac number, because 772012021 - 2⁷ = 772011893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 772011983 and 772012001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (772012091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35091445 + ... + 35091466.

It is an arithmetic number, because the mean of its divisors is an integer number (210548736).

Almost surely, 2^772012021 is an apocalyptic number.

It is an amenable number.

772012021 is a deficient number, since it is larger than the sum of its proper divisors (70182923).

772012021 is a wasteful number, since it uses less digits than its factorization.

772012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70182922.

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

The square root of 772012021 is about 27785.1043006860. The cubic root of 772012021 is about 917.3632841306.

Adding to 772012021 its reverse (120210277), we get a palindrome (892222298).

The spelling of 772012021 in words is "seven hundred seventy-two million, twelve thousand, twenty-one".