1221000022201 has 8 divisors (see below), whose sum is σ = 1274114738304. Its totient is φ = 1167887619360.

The previous prime is 1221000022199. The next prime is 1221000022211. The reversal of 1221000022201 is 1022200001221.

It is a happy number.

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 1221000022201 - 2¹ = 1221000022199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221000022211) 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, 546900 + ... + 1655626.

It is an arithmetic number, because the mean of its divisors is an integer number (159264342288).

Almost surely, 2^{1221000022201} is an apocalyptic number.

It is an amenable number.

1221000022201 is a deficient number, since it is larger than the sum of its proper divisors (53114716103).

1221000022201 is a wasteful number, since it uses less digits than its factorization.

1221000022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156631.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1221000022201 its reverse (1022200001221), we get a palindrome (2243200023422).

The spelling of 1221000022201 in words is "one trillion, two hundred twenty-one billion, twenty-two thousand, two hundred one".