2921939397851 has 2 divisors, whose sum is σ = 2921939397852. Its totient is φ = 2921939397850.

The previous prime is 2921939397841. The next prime is 2921939397913. The reversal of 2921939397851 is 1587939391292.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2921939397851 - 2³⁴ = 2904759528667 is a prime.

It is not a weakly prime, because it can be changed into another prime (2921939397841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1460969698925 + 1460969698926.

It is an arithmetic number, because the mean of its divisors is an integer number (1460969698926).

Almost surely, 2^{2921939397851} is an apocalyptic number.

2921939397851 is a deficient number, since it is larger than the sum of its proper divisors (1).

2921939397851 is an equidigital number, since it uses as much as digits as its factorization.

2921939397851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66134880, while the sum is 68.

The spelling of 2921939397851 in words is "two trillion, nine hundred twenty-one billion, nine hundred thirty-nine million, three hundred ninety-seven thousand, eight hundred fifty-one".