1220211100020 has 96 divisors (see below), whose sum is σ = 3764093348736. Its totient is φ = 292879936000.

The previous prime is 1220211099977. The next prime is 1220211100051. The reversal of 1220211100020 is 200011120221.

It is a super-2 number, since 2×1220211100020² (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 = 1220211099969 and 1220211100005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9085839 + ... + 9219158.

It is an arithmetic number, because the mean of its divisors is an integer number (39209305716).

Almost surely, 2^{1220211100020} is an apocalyptic number.

1220211100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220211100020 is an abundant number, since it is smaller than the sum of its proper divisors (2543882248716).

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

1220211100020 is a wasteful number, since it uses less digits than its factorization.

1220211100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18305121 (or 18305119 counting only the distinct ones).

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

Adding to 1220211100020 its reverse (200011120221), we get a palindrome (1420222220241).

It can be divided in two parts, 1220211 and 100020, that added together give a palindrome (1320231).

The spelling of 1220211100020 in words is "one trillion, two hundred twenty billion, two hundred eleven million, one hundred thousand, twenty".