20421314640253 has 8 divisors (see below), whose sum is σ = 21524092205400. Its totient is φ = 19345110028608.

The previous prime is 20421314640247. The next prime is 20421314640269. The reversal of 20421314640253 is 35204641312402.

It can be written as a sum of positive squares in 4 ways, for example, as 3896983950084 + 16524330690169 = 1974078^2 + 4065013^2 .

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 20421314640253 - 2⁴¹ = 18222291384701 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 (20421314340253) 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, 6643236798 + ... + 6643239871.

It is an arithmetic number, because the mean of its divisors is an integer number (2690511525675).

Almost surely, 2^{20421314640253} is an apocalyptic number.

It is an amenable number.

20421314640253 is a deficient number, since it is larger than the sum of its proper divisors (1102777565147).

20421314640253 is a wasteful number, since it uses less digits than its factorization.

20421314640253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13286476751.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 20421314640253 its reverse (35204641312402), we get a palindrome (55625955952655).

The spelling of 20421314640253 in words is "twenty trillion, four hundred twenty-one billion, three hundred fourteen million, six hundred forty thousand, two hundred fifty-three".