212123111222020 has 24 divisors (see below), whose sum is σ = 452761132479768. Its totient is φ = 83458273267200.

The previous prime is 212123111221997. The next prime is 212123111222023. The reversal of 212123111222020 is 20222111321212.

It can be written as a sum of positive squares in 4 ways, for example, as 4577828251396 + 207545282970624 = 2139586^2 + 14406432^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212123111221982 and 212123111222000.

It is not an unprimeable number, because it can be changed into a prime (212123111222023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86935700101 + ... + 86935702540.

It is an arithmetic number, because the mean of its divisors is an integer number (18865047186657).

Almost surely, 2^{212123111222020} is an apocalyptic number.

212123111222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212123111222020 is an abundant number, since it is smaller than the sum of its proper divisors (240638021257748).

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

212123111222020 is a wasteful number, since it uses less digits than its factorization.

212123111222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173871402711 (or 173871402709 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 212123111222020 its reverse (20222111321212), we get a palindrome (232345222543232).

The spelling of 212123111222020 in words is "two hundred twelve trillion, one hundred twenty-three billion, one hundred eleven million, two hundred twenty-two thousand, twenty".