20211293391 has 8 divisors (see below), whose sum is σ = 27044294064. Its totient is φ = 13426244160.

The previous prime is 20211293381. The next prime is 20211293407. The reversal of 20211293391 is 19339211202.

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

It is not a de Polignac number, because 20211293391 - 2¹⁴ = 20211277007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211293351) 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, 11986876 + ... + 11988561.

It is an arithmetic number, because the mean of its divisors is an integer number (3380536758).

Almost surely, 2^20211293391 is an apocalyptic number.

20211293391 is a deficient number, since it is larger than the sum of its proper divisors (6833000673).

20211293391 is a wasteful number, since it uses less digits than its factorization.

20211293391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23975721.

The product of its (nonzero) digits is 5832, while the sum is 33.

The spelling of 20211293391 in words is "twenty billion, two hundred eleven million, two hundred ninety-three thousand, three hundred ninety-one".