2121331012020 has 96 divisors (see below), whose sum is σ = 7199668909440. Its totient is φ = 514262062080.

The previous prime is 2121331011971. The next prime is 2121331012037. The reversal of 2121331012020 is 202101331212.

2121331012020 is a `hidden beast` number, since 2 + 1 + 213 + 310 + 120 + 20 = 666.

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 = 2121331011984 and 2121331012002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178557277 + ... + 178569156.

It is an arithmetic number, because the mean of its divisors is an integer number (74996551140).

Almost surely, 2^{2121331012020} is an apocalyptic number.

2121331012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121331012020 is an abundant number, since it is smaller than the sum of its proper divisors (5078337897420).

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

2121331012020 is a wasteful number, since it uses less digits than its factorization.

2121331012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357126462 (or 357126454 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 2121331012020 its reverse (202101331212), we get a palindrome (2323432343232).

The spelling of 2121331012020 in words is "two trillion, one hundred twenty-one billion, three hundred thirty-one million, twelve thousand, twenty".