20423212010421 has 16 divisors (see below), whose sum is σ = 30397338808320. Its totient is φ = 12089850660720.

The previous prime is 20423212010389. The next prime is 20423212010431. The reversal of 20423212010421 is 12401021232402.

It is not a de Polignac number, because 20423212010421 - 2⁵ = 20423212010389 is a prime.

It is a super-2 number, since 2×20423212010421² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20423212010391 and 20423212010400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423212010431) 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, 7196338261 + ... + 7196341098.

It is an arithmetic number, because the mean of its divisors is an integer number (1899833675520).

Almost surely, 2^{20423212010421} is an apocalyptic number.

It is an amenable number.

20423212010421 is a deficient number, since it is larger than the sum of its proper divisors (9974126797899).

20423212010421 is a wasteful number, since it uses less digits than its factorization.

20423212010421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14392679416.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 20423212010421 its reverse (12401021232402), we get a palindrome (32824233242823).

The spelling of 20423212010421 in words is "twenty trillion, four hundred twenty-three billion, two hundred twelve million, ten thousand, four hundred twenty-one".