20221421212423 has 16 divisors (see below), whose sum is σ = 20646760882176. Its totient is φ = 19797720153120.

The previous prime is 20221421212379. The next prime is 20221421212453. The reversal of 20221421212423 is 32421212412202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221421212423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221421212391 and 20221421212400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221421212453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133834986 + ... + 133985992.

It is an arithmetic number, because the mean of its divisors is an integer number (1290422555136).

Almost surely, 2^{20221421212423} is an apocalyptic number.

20221421212423 is a deficient number, since it is larger than the sum of its proper divisors (425339669753).

20221421212423 is a wasteful number, since it uses less digits than its factorization.

20221421212423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156414.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 20221421212423 its reverse (32421212412202), we get a palindrome (52642633624625).

The spelling of 20221421212423 in words is "twenty trillion, two hundred twenty-one billion, four hundred twenty-one million, two hundred twelve thousand, four hundred twenty-three".