221142502021 has 4 divisors (see below), whose sum is σ = 252734288032. Its totient is φ = 189550716012.

The previous prime is 221142501997. The next prime is 221142502079. The reversal of 221142502021 is 120205241122.

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 not a de Polignac number, because 221142502021 - 2⁵ = 221142501989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221142501983 and 221142502001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221142502421) 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, 15795892995 + ... + 15795893008.

It is an arithmetic number, because the mean of its divisors is an integer number (63183572008).

Almost surely, 2^221142502021 is an apocalyptic number.

It is an amenable number.

221142502021 is a deficient number, since it is larger than the sum of its proper divisors (31591786011).

221142502021 is an equidigital number, since it uses as much as digits as its factorization.

221142502021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31591786010.

The product of its (nonzero) digits is 640, while the sum is 22.

Adding to 221142502021 its reverse (120205241122), we get a palindrome (341347743143).

The spelling of 221142502021 in words is "two hundred twenty-one billion, one hundred forty-two million, five hundred two thousand, twenty-one".