20721460127 has 4 divisors (see below), whose sum is σ = 21622393200. Its totient is φ = 19820527056.

The previous prime is 20721460091. The next prime is 20721460129. The reversal of 20721460127 is 72106412702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20721460127 is a prime.

It is a super-2 number, since 2×20721460127² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20721460093 and 20721460102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20721460129) 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, 450466502 + ... + 450466547.

It is an arithmetic number, because the mean of its divisors is an integer number (5405598300).

Almost surely, 2^20721460127 is an apocalyptic number.

20721460127 is a deficient number, since it is larger than the sum of its proper divisors (900933073).

20721460127 is an equidigital number, since it uses as much as digits as its factorization.

20721460127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900933072.

The product of its (nonzero) digits is 9408, while the sum is 32.

Adding to 20721460127 its reverse (72106412702), we get a palindrome (92827872829).

The spelling of 20721460127 in words is "twenty billion, seven hundred twenty-one million, four hundred sixty thousand, one hundred twenty-seven".