212220231221020 has 48 divisors (see below), whose sum is σ = 486740614606848. Its totient is φ = 77081571325760.

The previous prime is 212220231220993. The next prime is 212220231221023. The reversal of 212220231221020 is 20122132022212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 212220231220982 and 212220231221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212220231221023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558696244 + ... + 559075963.

It is an arithmetic number, because the mean of its divisors is an integer number (10140429470976).

Almost surely, 2^{212220231221020} is an apocalyptic number.

212220231221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212220231221020 is an abundant number, since it is smaller than the sum of its proper divisors (274520383385828).

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

212220231221020 is a wasteful number, since it uses less digits than its factorization.

212220231221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117773090 (or 1117773088 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 212220231221020 its reverse (20122132022212), we get a palindrome (232342363243232).

The spelling of 212220231221020 in words is "two hundred twelve trillion, two hundred twenty billion, two hundred thirty-one million, two hundred twenty-one thousand, twenty".