19391021294 has 16 divisors (see below), whose sum is σ = 29131135488. Its totient is φ = 9680656992.

The previous prime is 19391021261. The next prime is 19391021339. The reversal of 19391021294 is 49212019391.

It is a super-2 number, since 2×19391021294² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4886099 + ... + 4890065.

It is an arithmetic number, because the mean of its divisors is an integer number (1820695968).

Almost surely, 2^19391021294 is an apocalyptic number.

19391021294 is a deficient number, since it is larger than the sum of its proper divisors (9740114194).

19391021294 is a wasteful number, since it uses less digits than its factorization.

19391021294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7099.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 19391021294 in words is "nineteen billion, three hundred ninety-one million, twenty-one thousand, two hundred ninety-four".