1210221100020 has 48 divisors (see below), whose sum is σ = 3407340763008. Its totient is φ = 320942609280.

The previous prime is 1210221099953. The next prime is 1210221100027. The reversal of 1210221100020 is 200011220121.

It is a super-2 number, since 2×1210221100020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1210221099969 and 1210221100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210221100027) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 55708344 + ... + 55730063.

It is an arithmetic number, because the mean of its divisors is an integer number (70986265896).

Almost surely, 2^{1210221100020} is an apocalyptic number.

1210221100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210221100020 is an abundant number, since it is smaller than the sum of its proper divisors (2197119662988).

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

1210221100020 is a wasteful number, since it uses less digits than its factorization.

1210221100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111438600 (or 111438598 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1210221100020 its reverse (200011220121), we get a palindrome (1410232320141).

The spelling of 1210221100020 in words is "one trillion, two hundred ten billion, two hundred twenty-one million, one hundred thousand, twenty".