21201010424142 has 16 divisors (see below), whose sum is σ = 42402066625920. Its totient is φ = 7066995845112.

The previous prime is 21201010424141. The next prime is 21201010424173. The reversal of 21201010424142 is 24142401010212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201010424141) 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, 8387709 + ... + 10618647.

It is an arithmetic number, because the mean of its divisors is an integer number (2650129164120).

Almost surely, 2^{21201010424142} is an apocalyptic number.

21201010424142 is an abundant number, since it is smaller than the sum of its proper divisors (21201056201778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201010424142 is a wasteful number, since it uses less digits than its factorization.

21201010424142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3814807.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 21201010424142 its reverse (24142401010212), we get a palindrome (45343411434354).

The spelling of 21201010424142 in words is "twenty-one trillion, two hundred one billion, ten million, four hundred twenty-four thousand, one hundred forty-two".