420202244221 has 4 divisors (see below), whose sum is σ = 420222936672. Its totient is φ = 420181551772.

The previous prime is 420202244219. The next prime is 420202244263. The reversal of 420202244221 is 122442202024.

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 420202244221 - 2¹ = 420202244219 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 (420202244521) 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, 10315735 + ... + 10356388.

It is an arithmetic number, because the mean of its divisors is an integer number (105055734168).

Almost surely, 2^420202244221 is an apocalyptic number.

It is an amenable number.

420202244221 is a deficient number, since it is larger than the sum of its proper divisors (20692451).

420202244221 is a wasteful number, since it uses less digits than its factorization.

420202244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20692450.

The product of its (nonzero) digits is 4096, while the sum is 25.

Adding to 420202244221 its reverse (122442202024), we get a palindrome (542644446245).

The spelling of 420202244221 in words is "four hundred twenty billion, two hundred two million, two hundred forty-four thousand, two hundred twenty-one".