1221102132020 has 12 divisors (see below), whose sum is σ = 2564314477284. Its totient is φ = 488440852800.

The previous prime is 1221102132017. The next prime is 1221102132037. The reversal of 1221102132020 is 202312011221.

It can be written as a sum of positive squares in 2 ways, for example, as 722996485264 + 498105646756 = 850292^2 + 705766^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1221102132020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30527553281 + ... + 30527553320.

It is an arithmetic number, because the mean of its divisors is an integer number (213692873107).

Almost surely, 2^{1221102132020} is an apocalyptic number.

1221102132020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221102132020 is an abundant number, since it is smaller than the sum of its proper divisors (1343212345264).

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

1221102132020 is a wasteful number, since it uses less digits than its factorization.

1221102132020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61055106610 (or 61055106608 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1221102132020 its reverse (202312011221), we get a palindrome (1423414143241).

The spelling of 1221102132020 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred thirty-two thousand, twenty".