1221122021012 has 24 divisors (see below), whose sum is σ = 2184548002560. Its totient is φ = 596990653280.

The previous prime is 1221122020997. The next prime is 1221122021027. The reversal of 1221122021012 is 2101202211221.

It is an interprime number because it is at equal distance from previous prime (1221122020997) and next prime (1221122021027).

It is a super-2 number, since 2×1221122021012² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2956187 + ... + 3343842.

It is an arithmetic number, because the mean of its divisors is an integer number (91022833440).

Almost surely, 2^{1221122021012} is an apocalyptic number.

It is an amenable number.

1221122021012 is a deficient number, since it is larger than the sum of its proper divisors (963425981548).

1221122021012 is a wasteful number, since it uses less digits than its factorization.

1221122021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6301111 (or 6301109 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221122021012 its reverse (2101202211221), we get a palindrome (3322324232233).

The spelling of 1221122021012 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, twenty-one thousand, twelve".