20831219435291 has 8 divisors (see below), whose sum is σ = 20942082019584. Its totient is φ = 20720375586880.

The previous prime is 20831219435219. The next prime is 20831219435293. The reversal of 20831219435291 is 19253491213802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20831219435291 - 2³⁴ = 20814039566107 is a prime.

It is a super-2 number, since 2×20831219435291² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20831219435293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2451560 + ... + 6904533.

It is an arithmetic number, because the mean of its divisors is an integer number (2617760252448).

Almost surely, 2^{20831219435291} is an apocalyptic number.

20831219435291 is a deficient number, since it is larger than the sum of its proper divisors (110862584293).

20831219435291 is a wasteful number, since it uses less digits than its factorization.

20831219435291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367941.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 20831219435291 in words is "twenty trillion, eight hundred thirty-one billion, two hundred nineteen million, four hundred thirty-five thousand, two hundred ninety-one".