1211223012020 has 72 divisors (see below), whose sum is σ = 3114573507360. Its totient is φ = 393419799360.

The previous prime is 1211223011959. The next prime is 1211223012029. The reversal of 1211223012020 is 202103221121.

It is a super-2 number, since 2×1211223012020² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211223012020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211223012029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32506166 + ... + 32543405.

It is an arithmetic number, because the mean of its divisors is an integer number (43257965380).

Almost surely, 2^{1211223012020} is an apocalyptic number.

1211223012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211223012020 is an abundant number, since it is smaller than the sum of its proper divisors (1903350495340).

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

1211223012020 is a wasteful number, since it uses less digits than its factorization.

1211223012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65049613 (or 65049604 counting only the distinct ones).

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

Adding to 1211223012020 its reverse (202103221121), we get a palindrome (1413326233141).

The spelling of 1211223012020 in words is "one trillion, two hundred eleven billion, two hundred twenty-three million, twelve thousand, twenty".