1221001202022 has 48 divisors (see below), whose sum is σ = 2876654914560. Its totient is φ = 344441562192.

The previous prime is 1221001201997. The next prime is 1221001202027. The reversal of 1221001202022 is 2202021001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221001201992 and 1221001202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001202027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26261998 + ... + 26308449.

It is an arithmetic number, because the mean of its divisors is an integer number (59930310720).

Almost surely, 2^{1221001202022} is an apocalyptic number.

1221001202022 is an abundant number, since it is smaller than the sum of its proper divisors (1655653712538).

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

1221001202022 is a wasteful number, since it uses less digits than its factorization.

1221001202022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52570545 (or 52570538 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1221001202022 its reverse (2202021001221), we get a palindrome (3423022203243).

The spelling of 1221001202022 in words is "one trillion, two hundred twenty-one billion, one million, two hundred two thousand, twenty-two".