20451321044351 has 4 divisors (see below), whose sum is σ = 20453300278632. Its totient is φ = 20449341810072.

The previous prime is 20451321044281. The next prime is 20451321044369. The reversal of 20451321044351 is 15344012315402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20451321044351 - 2³⁸ = 20176443137407 is a prime.

It is a super-2 number, since 2×20451321044351² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20451321044381) 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, 989601641 + ... + 989622306.

It is an arithmetic number, because the mean of its divisors is an integer number (5113325069658).

Almost surely, 2^{20451321044351} is an apocalyptic number.

20451321044351 is a deficient number, since it is larger than the sum of its proper divisors (1979234281).

20451321044351 is a wasteful number, since it uses less digits than its factorization.

20451321044351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979234280.

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 20451321044351 its reverse (15344012315402), we get a palindrome (35795333359753).

The spelling of 20451321044351 in words is "twenty trillion, four hundred fifty-one billion, three hundred twenty-one million, forty-four thousand, three hundred fifty-one".