20421442113031 has 16 divisors (see below), whose sum is σ = 20920761492480. Its totient is φ = 19927251678400.

The previous prime is 20421442112999. The next prime is 20421442113041. The reversal of 20421442113031 is 13031124412402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20421442113031 - 2⁵ = 20421442112999 is a prime.

It is a super-2 number, since 2×20421442113031² (a number of 27 digits) contains 22 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 (20421442113041) 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, 113484330 + ... + 113664136.

It is an arithmetic number, because the mean of its divisors is an integer number (1307547593280).

Almost surely, 2^{20421442113031} is an apocalyptic number.

20421442113031 is a deficient number, since it is larger than the sum of its proper divisors (499319379449).

20421442113031 is a wasteful number, since it uses less digits than its factorization.

20421442113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194054.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 20421442113031 its reverse (13031124412402), we get a palindrome (33452566525433).

The spelling of 20421442113031 in words is "twenty trillion, four hundred twenty-one billion, four hundred forty-two million, one hundred thirteen thousand, thirty-one".