2221212012221 has 8 divisors (see below), whose sum is σ = 2228727007104. Its totient is φ = 2213699407920.

The previous prime is 2221212012179. The next prime is 2221212012281. The reversal of 2221212012221 is 1222102121222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221212012221 - 2²⁶ = 2221144903357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221212012193 and 2221212012202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221212012281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273691 + ... + 2462663.

It is an arithmetic number, because the mean of its divisors is an integer number (278590875888).

Almost surely, 2^{2221212012221} is an apocalyptic number.

It is an amenable number.

2221212012221 is a deficient number, since it is larger than the sum of its proper divisors (7514994883).

2221212012221 is a wasteful number, since it uses less digits than its factorization.

2221212012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195291.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2221212012221 its reverse (1222102121222), we get a palindrome (3443314133443).

The spelling of 2221212012221 in words is "two trillion, two hundred twenty-one billion, two hundred twelve million, twelve thousand, two hundred twenty-one".