20212312421 has 4 divisors (see below), whose sum is σ = 23099785632. Its totient is φ = 17324839212.

The previous prime is 20212312409. The next prime is 20212312441. The reversal of 20212312421 is 12421321202.

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 not a de Polignac number, because 20212312421 - 2³⁰ = 19138570597 is a prime.

It is a super-2 number, since 2×20212312421² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20212312393 and 20212312402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212312441) 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, 1443736595 + ... + 1443736608.

It is an arithmetic number, because the mean of its divisors is an integer number (5774946408).

Almost surely, 2^20212312421 is an apocalyptic number.

It is an amenable number.

20212312421 is a deficient number, since it is larger than the sum of its proper divisors (2887473211).

20212312421 is an equidigital number, since it uses as much as digits as its factorization.

20212312421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887473210.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20212312421 its reverse (12421321202), we get a palindrome (32633633623).

The spelling of 20212312421 in words is "twenty billion, two hundred twelve million, three hundred twelve thousand, four hundred twenty-one".