20310123421 has 8 divisors (see below), whose sum is σ = 23212435904. Its totient is φ = 17408027520.

The previous prime is 20310123419. The next prime is 20310123433. The reversal of 20310123421 is 12432101302.

It is a happy number.

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 20310123421 - 2¹ = 20310123419 is a prime.

It is a super-2 number, since 2×20310123421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20310123451) 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, 310906 + ... + 370516.

It is an arithmetic number, because the mean of its divisors is an integer number (2901554488).

Almost surely, 2^20310123421 is an apocalyptic number.

It is an amenable number.

20310123421 is a deficient number, since it is larger than the sum of its proper divisors (2902312483).

20310123421 is an equidigital number, since it uses as much as digits as its factorization.

20310123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108291.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20310123421 its reverse (12432101302), we get a palindrome (32742224723).

The spelling of 20310123421 in words is "twenty billion, three hundred ten million, one hundred twenty-three thousand, four hundred twenty-one".