2221210123021 has 4 divisors (see below), whose sum is σ = 2229655789152. Its totient is φ = 2212764456892.

The previous prime is 2221210123009. The next prime is 2221210123063. The reversal of 2221210123021 is 1203210121222.

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 2221210123021 - 2¹¹ = 2221210120973 is a prime.

It is a super-2 number, since 2×2221210123021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2221210123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221210153021) 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, 4222832671 + ... + 4222833196.

It is an arithmetic number, because the mean of its divisors is an integer number (557413947288).

Almost surely, 2^{2221210123021} is an apocalyptic number.

It is an amenable number.

2221210123021 is a deficient number, since it is larger than the sum of its proper divisors (8445666131).

2221210123021 is an equidigital number, since it uses as much as digits as its factorization.

2221210123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8445666130.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 2221210123021 its reverse (1203210121222), we get a palindrome (3424420244243).

The spelling of 2221210123021 in words is "two trillion, two hundred twenty-one billion, two hundred ten million, one hundred twenty-three thousand, twenty-one".