2221210120021 has 4 divisors (see below), whose sum is σ = 2227397335200. Its totient is φ = 2215022904844.

The previous prime is 2221210120009. The next prime is 2221210120049. The reversal of 2221210120021 is 1200210121222.

It is a happy number.

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 2221210120021 - 2¹³ = 2221210111829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221210119977 and 2221210120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221210120001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3093607051 + ... + 3093607768.

It is an arithmetic number, because the mean of its divisors is an integer number (556849333800).

Almost surely, 2^{2221210120021} is an apocalyptic number.

It is an amenable number.

2221210120021 is a deficient number, since it is larger than the sum of its proper divisors (6187215179).

2221210120021 is an equidigital number, since it uses as much as digits as its factorization.

2221210120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6187215178.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2221210120021 its reverse (1200210121222), we get a palindrome (3421420241243).

The spelling of 2221210120021 in words is "two trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty thousand, twenty-one".