2621212397 has 2 divisors, whose sum is σ = 2621212398. Its totient is φ = 2621212396.

The previous prime is 2621212343. The next prime is 2621212427. The reversal of 2621212397 is 7932121262.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2298147721 + 323064676 = 47939^2 + 17974^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621212397 - 2⁸ = 2621212141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2621212597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1310606198 + 1310606199.

It is an arithmetic number, because the mean of its divisors is an integer number (1310606199).

Almost surely, 2^2621212397 is an apocalyptic number.

It is an amenable number.

2621212397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2621212397 is an equidigital number, since it uses as much as digits as its factorization.

2621212397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 2621212397 is about 51197.7772662056. Note that the first 3 decimals coincide. The cubic root of 2621212397 is about 1378.7982952084.

The spelling of 2621212397 in words is "two billion, six hundred twenty-one million, two hundred twelve thousand, three hundred ninety-seven".