420142214311021 has 4 divisors (see below), whose sum is σ = 434629876873500. Its totient is φ = 405654551748544.

The previous prime is 420142214310991. The next prime is 420142214311049. The reversal of 420142214311021 is 120113412241024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 355948067295396 + 64194147015625 = 18866586^2 + 8012125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420142214311021 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 (420142214311051) 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, 7243831281196 + ... + 7243831281253.

It is an arithmetic number, because the mean of its divisors is an integer number (108657469218375).

Almost surely, 2^{420142214311021} is an apocalyptic number.

It is an amenable number.

420142214311021 is a deficient number, since it is larger than the sum of its proper divisors (14487662562479).

420142214311021 is a wasteful number, since it uses less digits than its factorization.

420142214311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14487662562478.

The product of its (nonzero) digits is 3072, while the sum is 28.

Adding to 420142214311021 its reverse (120113412241024), we get a palindrome (540255626552045).

The spelling of 420142214311021 in words is "four hundred twenty trillion, one hundred forty-two billion, two hundred fourteen million, three hundred eleven thousand, twenty-one".