1221321133002 has 16 divisors (see below), whose sum is σ = 2442661676352. Its totient is φ = 407103809280.

The previous prime is 1221321132991. The next prime is 1221321133051. The reversal of 1221321133002 is 2003311231221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221321133002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85227 + ... + 1565217.

It is an arithmetic number, because the mean of its divisors is an integer number (152666354772).

Almost surely, 2^{1221321133002} is an apocalyptic number.

1221321133002 is an abundant number, since it is smaller than the sum of its proper divisors (1221340543350).

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

1221321133002 is a wasteful number, since it uses less digits than its factorization.

1221321133002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617533.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1221321133002 its reverse (2003311231221), we get a palindrome (3224632364223).

The spelling of 1221321133002 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-three thousand, two".