2121642113544 has 48 divisors (see below), whose sum is σ = 5749182289500. Its totient is φ = 706836409344.

The previous prime is 2121642113489. The next prime is 2121642113561. The reversal of 2121642113544 is 4453112461212.

2121642113544 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 642 + 1 + 1 + 3 + 5 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1761029853444 + 360612260100 = 1327038^2 + 600510^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2121642113499 and 2121642113508.

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, 7731469 + ... + 8001180.

Almost surely, 2^{2121642113544} is an apocalyptic number.

2121642113544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2121642113544 is an abundant number, since it is smaller than the sum of its proper divisors (3627540175956).

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

2121642113544 is a wasteful number, since it uses less digits than its factorization.

2121642113544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15734534 (or 15734527 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

Adding to 2121642113544 its reverse (4453112461212), we get a palindrome (6574754574756).

The spelling of 2121642113544 in words is "two trillion, one hundred twenty-one billion, six hundred forty-two million, one hundred thirteen thousand, five hundred forty-four".