34157201621 has 2 divisors, whose sum is σ = 34157201622. Its totient is φ = 34157201620.

The previous prime is 34157201563. The next prime is 34157201623. The reversal of 34157201621 is 12610275143.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21889202500 + 12267999121 = 147950^2 + 110761^2 .

It is a cyclic number.

It is not a de Polignac number, because 34157201621 - 2¹⁸ = 34156939477 is a prime.

It is a Sophie Germain prime.

Together with 34157201623, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (34157201623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17078600810 + 17078600811.

It is an arithmetic number, because the mean of its divisors is an integer number (17078600811).

Almost surely, 2^34157201621 is an apocalyptic number.

It is an amenable number.

34157201621 is a deficient number, since it is larger than the sum of its proper divisors (1).

34157201621 is an equidigital number, since it uses as much as digits as its factorization.

34157201621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 34157201621 its reverse (12610275143), we get a palindrome (46767476764).

The spelling of 34157201621 in words is "thirty-four billion, one hundred fifty-seven million, two hundred one thousand, six hundred twenty-one".