2921939397870 has 32 divisors (see below), whose sum is σ = 7425163647648. Its totient is φ = 733349495808.

The previous prime is 2921939397851. The next prime is 2921939397913. The reversal of 2921939397870 is 787939391292.

It is a junction number, because it is equal to n+sod(n) for n = 2921939397795 and 2921939397804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2864645959 + ... + 2864646978.

It is an arithmetic number, because the mean of its divisors is an integer number (232036363989).

Almost surely, 2^{2921939397870} is an apocalyptic number.

2921939397870 is an abundant number, since it is smaller than the sum of its proper divisors (4503224249778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2921939397870 is a wasteful number, since it uses less digits than its factorization.

2921939397870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5729292964.

The product of its (nonzero) digits is 92588832, while the sum is 69.

The spelling of 2921939397870 in words is "two trillion, nine hundred twenty-one billion, nine hundred thirty-nine million, three hundred ninety-seven thousand, eight hundred seventy".