142105105222021 has 4 divisors (see below), whose sum is σ = 142132607666752. Its totient is φ = 142077602777292.

The previous prime is 142105105222007. The next prime is 142105105222097. The reversal of 142105105222021 is 120222501501241.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 142105105222021 - 2⁴⁵ = 106920733133189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142105105222921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13751214615 + ... + 13751224948.

It is an arithmetic number, because the mean of its divisors is an integer number (35533151916688).

Almost surely, 2^{142105105222021} is an apocalyptic number.

It is an amenable number.

142105105222021 is a deficient number, since it is larger than the sum of its proper divisors (27502444731).

142105105222021 is an equidigital number, since it uses as much as digits as its factorization.

142105105222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27502444730.

The product of its (nonzero) digits is 3200, while the sum is 28.

Adding to 142105105222021 its reverse (120222501501241), we get a palindrome (262327606723262).

The spelling of 142105105222021 in words is "one hundred forty-two trillion, one hundred five billion, one hundred five million, two hundred twenty-two thousand, twenty-one".