1221000011022 has 24 divisors (see below), whose sum is σ = 2684181844008. Its totient is φ = 370000003120.

The previous prime is 1221000010973. The next prime is 1221000011029. The reversal of 1221000011022 is 2201100001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221000010989 and 1221000011007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000011029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840908373 + ... + 840909824.

It is an arithmetic number, because the mean of its divisors is an integer number (111840910167).

Almost surely, 2^{1221000011022} is an apocalyptic number.

1221000011022 is an abundant number, since it is smaller than the sum of its proper divisors (1463181832986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221000011022 is a wasteful number, since it uses less digits than its factorization.

1221000011022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1681818224 (or 1681818213 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1221000011022 its reverse (2201100001221), we get a palindrome (3422100012243).

The spelling of 1221000011022 in words is "one trillion, two hundred twenty-one billion, eleven thousand, twenty-two".