20315263236421 has 8 divisors (see below), whose sum is σ = 21198906581184. Its totient is φ = 19431650810880.

The previous prime is 20315263236419. The next prime is 20315263236571. The reversal of 20315263236421 is 12463236251302.

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 20315263236421 - 2¹ = 20315263236419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315263236221) 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, 6382140 + ... + 9020101.

It is an arithmetic number, because the mean of its divisors is an integer number (2649863322648).

Almost surely, 2^{20315263236421} is an apocalyptic number.

It is an amenable number.

20315263236421 is a deficient number, since it is larger than the sum of its proper divisors (883643344763).

20315263236421 is a wasteful number, since it uses less digits than its factorization.

20315263236421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15459611.

The product of its (nonzero) digits is 311040, while the sum is 40.

Adding to 20315263236421 its reverse (12463236251302), we get a palindrome (32778499487723).

The spelling of 20315263236421 in words is "twenty trillion, three hundred fifteen billion, two hundred sixty-three million, two hundred thirty-six thousand, four hundred twenty-one".