20203131022421 has 4 divisors (see below), whose sum is σ = 20203430400000. Its totient is φ = 20202831644844.

The previous prime is 20203131022387. The next prime is 20203131022423. The reversal of 20203131022421 is 12422013130202.

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 a de Polignac number, because none of the positive numbers 2^k-20203131022421 is a prime.

It is a super-3 number, since 3×20203131022421³ (a number of 41 digits) contains 333 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 (20203131022423) 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, 149587541 + ... + 149722538.

It is an arithmetic number, because the mean of its divisors is an integer number (5050857600000).

Almost surely, 2^{20203131022421} is an apocalyptic number.

It is an amenable number.

20203131022421 is a deficient number, since it is larger than the sum of its proper divisors (299377579).

20203131022421 is an equidigital number, since it uses as much as digits as its factorization.

20203131022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299377578.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20203131022421 its reverse (12422013130202), we get a palindrome (32625144152623).

The spelling of 20203131022421 in words is "twenty trillion, two hundred three billion, one hundred thirty-one million, twenty-two thousand, four hundred twenty-one".