1221402123020 has 12 divisors (see below), whose sum is σ = 2564944458384. Its totient is φ = 488560849200.

The previous prime is 1221402122989. The next prime is 1221402123043. The reversal of 1221402123020 is 203212041221.

It is a super-2 number, since 2×1221402123020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 61070106151 = 1221402123020 / (1 + 2 + 2 + 1 + 4 + 0 + 2 + 1 + 2 + 3 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1221402122983 and 1221402123001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30535053056 + ... + 30535053095.

It is an arithmetic number, because the mean of its divisors is an integer number (213745371532).

Almost surely, 2^{1221402123020} is an apocalyptic number.

1221402123020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221402123020 is an abundant number, since it is smaller than the sum of its proper divisors (1343542335364).

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

1221402123020 is a wasteful number, since it uses less digits than its factorization.

1221402123020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61070106160 (or 61070106158 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1221402123020 its reverse (203212041221), we get a palindrome (1424614164241).

The spelling of 1221402123020 in words is "one trillion, two hundred twenty-one billion, four hundred two million, one hundred twenty-three thousand, twenty".