2121400112020 has 24 divisors (see below), whose sum is σ = 5091360269184. Its totient is φ = 727337181216.

The previous prime is 2121400112009. The next prime is 2121400112021. The reversal of 2121400112020 is 202110041212.

It is a junction number, because it is equal to n+sod(n) for n = 2121400111985 and 2121400112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121400112021) 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, 7576428832 + ... + 7576429111.

It is an arithmetic number, because the mean of its divisors is an integer number (212140011216).

Almost surely, 2^{2121400112020} is an apocalyptic number.

2121400112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121400112020 is an abundant number, since it is smaller than the sum of its proper divisors (2969960157164).

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

2121400112020 is a wasteful number, since it uses less digits than its factorization.

2121400112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15152857959 (or 15152857957 counting only the distinct ones).

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

Adding to 2121400112020 its reverse (202110041212), we get a palindrome (2323510153232).

The spelling of 2121400112020 in words is "two trillion, one hundred twenty-one billion, four hundred million, one hundred twelve thousand, twenty".