1220121122221 has 8 divisors (see below), whose sum is σ = 1224796680800. Its totient is φ = 1215450117648.

The previous prime is 1220121122191. The next prime is 1220121122261. The reversal of 1220121122221 is 1222211210221.

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 1220121122221 - 2²³ = 1220112733613 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 (1220121122261) 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, 601146 + ... + 1673803.

It is an arithmetic number, because the mean of its divisors is an integer number (153099585100).

Almost surely, 2^{1220121122221} is an apocalyptic number.

It is an amenable number.

1220121122221 is a deficient number, since it is larger than the sum of its proper divisors (4675558579).

1220121122221 is a wasteful number, since it uses less digits than its factorization.

1220121122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277003.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1220121122221 its reverse (1222211210221), we get a palindrome (2442332332442).

The spelling of 1220121122221 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".