1221211212122 has 16 divisors (see below), whose sum is σ = 2025720220032. Its totient is φ = 547491949920.

The previous prime is 1221211211959. The next prime is 1221211212187. The reversal of 1221211212122 is 2212121121221.

It is a super-2 number, since 2×1221211212122² (a number of 25 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221211212094 and 1221211212103.

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, 380201138 + ... + 380204349.

It is an arithmetic number, because the mean of its divisors is an integer number (126607513752).

Almost surely, 2^{1221211212122} is an apocalyptic number.

1221211212122 is a deficient number, since it is larger than the sum of its proper divisors (804509007910).

1221211212122 is a wasteful number, since it uses less digits than its factorization.

1221211212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760405573.

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

Adding to 1221211212122 its reverse (2212121121221), we get a palindrome (3433332333343).

Subtracting 1221211212122 from its reverse (2212121121221), we obtain a palindrome (990909909099).

The spelling of 1221211212122 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred twenty-two".