12020001221520 has 60 divisors (see below), whose sum is σ = 40367170771356. Its totient is φ = 3205333658880.

The previous prime is 12020001221509. The next prime is 12020001221537. The reversal of 12020001221520 is 2512210002021.

12020001221520 is a `hidden beast` number, since 1 + 2 + 0 + 20 + 0 + 0 + 122 + 1 + 520 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8475923886336 + 3544077335184 = 2911344^2 + 1882572^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×12020001221520² (a number of 27 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 = 12020001221493 and 12020001221502.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8347222351 + ... + 8347223790.

Almost surely, 2^{12020001221520} is an apocalyptic number.

12020001221520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12020001221520 is an abundant number, since it is smaller than the sum of its proper divisors (28347169549836).

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

12020001221520 is a wasteful number, since it uses less digits than its factorization.

12020001221520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16694446160 (or 16694446151 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 12020001221520 its reverse (2512210002021), we get a palindrome (14532211223541).

The spelling of 12020001221520 in words is "twelve trillion, twenty billion, one million, two hundred twenty-one thousand, five hundred twenty".