2921939397869 has 4 divisors (see below), whose sum is σ = 3022695928860. Its totient is φ = 2821182866880.

The previous prime is 2921939397851. The next prime is 2921939397913. The reversal of 2921939397869 is 9687939391292.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1446759112969 + 1475180284900 = 1202813^2 + 1214570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2921939397869 is a prime.

It is a super-2 number, since 2×2921939397869² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2921939397869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2921939390869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50378265452 + ... + 50378265509.

It is an arithmetic number, because the mean of its divisors is an integer number (755673982215).

Almost surely, 2^{2921939397869} is an apocalyptic number.

2921939397869 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2921939397869 is a deficient number, since it is larger than the sum of its proper divisors (100756530991).

2921939397869 is a wasteful number, since it uses less digits than its factorization.

2921939397869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100756530990.

The product of its digits is 714256704, while the sum is 77.

The spelling of 2921939397869 in words is "two trillion, nine hundred twenty-one billion, nine hundred thirty-nine million, three hundred ninety-seven thousand, eight hundred sixty-nine".