12021221012020 has 24 divisors (see below), whose sum is σ = 27539524500768. Its totient is φ = 4371353095200.

The previous prime is 12021221011991. The next prime is 12021221012089. The reversal of 12021221012020 is 2021012212021.

It is a happy number.

It is a super-3 number, since 3×12021221012020³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12021221011985 and 12021221012003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27320956626 + ... + 27320957065.

It is an arithmetic number, because the mean of its divisors is an integer number (1147480187532).

Almost surely, 2^{12021221012020} is an apocalyptic number.

12021221012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12021221012020 is an abundant number, since it is smaller than the sum of its proper divisors (15518303488748).

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

12021221012020 is a wasteful number, since it uses less digits than its factorization.

12021221012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54641913711 (or 54641913709 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12021221012020 its reverse (2021012212021), we get a palindrome (14042233224041).

The spelling of 12021221012020 in words is "twelve trillion, twenty-one billion, two hundred twenty-one million, twelve thousand, twenty".