312021012220020 has 72 divisors (see below), whose sum is σ = 946469384054376. Its totient is φ = 83205106820352.

The previous prime is 312021012220013. The next prime is 312021012220033. The reversal of 312021012220020 is 20022210120213.

312021012220020 is a `hidden beast` number, since 312 + 0 + 2 + 10 + 122 + 200 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 19758327261156 + 292262684958864 = 4445034^2 + 17095692^2 .

It is a super-2 number, since 2×312021012220020² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 312021012219975 and 312021012220002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25588314 + ... + 35760366.

Almost surely, 2^{312021012220020} is an apocalyptic number.

312021012220020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

312021012220020 is an abundant number, since it is smaller than the sum of its proper divisors (634448371834356).

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

312021012220020 is a wasteful number, since it uses less digits than its factorization.

312021012220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10342481 (or 10342476 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 312021012220020 its reverse (20022210120213), we get a palindrome (332043222340233).

The spelling of 312021012220020 in words is "three hundred twelve trillion, twenty-one billion, twelve million, two hundred twenty thousand, twenty".