1221001020202 has 4 divisors (see below), whose sum is σ = 1831501530306. Its totient is φ = 610500510100.

The previous prime is 1221001020199. The next prime is 1221001020203. The reversal of 1221001020202 is 2020201001221.

It is a happy number.

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., 1094344039881 + 126656980321 = 1046109^2 + 355889^2 .

It is not an unprimeable number, because it can be changed into a prime (1221001020203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305250255049 + ... + 305250255052.

Almost surely, 2^{1221001020202} is an apocalyptic number.

1221001020202 is a deficient number, since it is larger than the sum of its proper divisors (610500510104).

1221001020202 is an equidigital number, since it uses as much as digits as its factorization.

1221001020202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610500510103.

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

Adding to 1221001020202 its reverse (2020201001221), we get a palindrome (3241202021423).

The spelling of 1221001020202 in words is "one trillion, two hundred twenty-one billion, one million, twenty thousand, two hundred two".