20315111351221 has 4 divisors (see below), whose sum is σ = 20315230834752. Its totient is φ = 20314991867692.

The previous prime is 20315111351219. The next prime is 20315111351237. The reversal of 20315111351221 is 12215311151302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20315111351221 - 2¹ = 20315111351219 is a prime.

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 20315111351221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315111354221) 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, 59486365 + ... + 59826898.

It is an arithmetic number, because the mean of its divisors is an integer number (5078807708688).

Almost surely, 2^{20315111351221} is an apocalyptic number.

It is an amenable number.

20315111351221 is a deficient number, since it is larger than the sum of its proper divisors (119483531).

20315111351221 is a wasteful number, since it uses less digits than its factorization.

20315111351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119483530.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 20315111351221 in words is "twenty trillion, three hundred fifteen billion, one hundred eleven million, three hundred fifty-one thousand, two hundred twenty-one".