2121640236434 has 8 divisors (see below), whose sum is σ = 3182485536588. Its totient is φ = 1060811724240.

The previous prime is 2121640236431. The next prime is 2121640236451. The reversal of 2121640236434 is 4346320461212.

It can be written as a sum of positive squares in 2 ways, for example, as 2108115244225 + 13524992209 = 1451935^2 + 116297^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2121640236431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3876137 + ... + 4389500.

Almost surely, 2^{2121640236434} is an apocalyptic number.

2121640236434 is a deficient number, since it is larger than the sum of its proper divisors (1060845300154).

2121640236434 is a wasteful number, since it uses less digits than its factorization.

2121640236434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8393980.

The product of its (nonzero) digits is 165888, while the sum is 38.

Adding to 2121640236434 its reverse (4346320461212), we get a palindrome (6467960697646).

The spelling of 2121640236434 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, two hundred thirty-six thousand, four hundred thirty-four".