7620922921 has 2 divisors, whose sum is σ = 7620922922. Its totient is φ = 7620922920.

The previous prime is 7620922919. The next prime is 7620922937. The reversal of 7620922921 is 1292290267.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6616032921 + 1004890000 = 81339^2 + 31700^2 .

It is an emirp because it is prime and its reverse (1292290267) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7620922921 - 2¹ = 7620922919 is a prime.

Together with 7620922919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7620922901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3810461460 + 3810461461.

It is an arithmetic number, because the mean of its divisors is an integer number (3810461461).

Almost surely, 2^7620922921 is an apocalyptic number.

It is an amenable number.

7620922921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7620922921 is an equidigital number, since it uses as much as digits as its factorization.

7620922921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 7620922921 is about 87297.8975749130. The cubic root of 7620922921 is about 1967.8977222312.

The spelling of 7620922921 in words is "seven billion, six hundred twenty million, nine hundred twenty-two thousand, nine hundred twenty-one".