1221121121402 has 32 divisors (see below), whose sum is σ = 2306804852352. Its totient is φ = 471846441024.

The previous prime is 1221121121371. The next prime is 1221121121413. The reversal of 1221121121402 is 2041211211221.

It is a super-2 number, since 2×1221121121402² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78009113 + ... + 78024764.

It is an arithmetic number, because the mean of its divisors is an integer number (72087651636).

Almost surely, 2^{1221121121402} is an apocalyptic number.

1221121121402 is a deficient number, since it is larger than the sum of its proper divisors (1085683730950).

1221121121402 is a wasteful number, since it uses less digits than its factorization.

1221121121402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156033942.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 1221121121402 its reverse (2041211211221), we get a palindrome (3262332332623).

The spelling of 1221121121402 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, four hundred two".