1221011020202 has 4 divisors (see below), whose sum is σ = 1831516530306. Its totient is φ = 610505510100.

The previous prime is 1221011020199. The next prime is 1221011020213. The reversal of 1221011020202 is 2020201101221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 663851782441 + 557159237761 = 814771^2 + 746431^2 .

It is a super-2 number, since 2×1221011020202² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305252755049 + ... + 305252755052.

Almost surely, 2^{1221011020202} is an apocalyptic number.

1221011020202 is a deficient number, since it is larger than the sum of its proper divisors (610505510104).

1221011020202 is an equidigital number, since it uses as much as digits as its factorization.

1221011020202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610505510103.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221011020202 its reverse (2020201101221), we get a palindrome (3241212121423).

The spelling of 1221011020202 in words is "one trillion, two hundred twenty-one billion, eleven million, twenty thousand, two hundred two".