2121640236433 has 24 divisors (see below), whose sum is σ = 2352692466432. Its totient is φ = 1909273327104.

The previous prime is 2121640236431. The next prime is 2121640236451. The reversal of 2121640236433 is 3346320461212.

It is not a de Polignac number, because 2121640236433 - 2¹ = 2121640236431 is a prime.

It is a super-2 number, since 2×2121640236433² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121640236392 and 2121640236401.

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 23 ways as a sum of consecutive naturals, for example, 17334216 + ... + 17456182.

It is an arithmetic number, because the mean of its divisors is an integer number (98028852768).

Almost surely, 2^{2121640236433} is an apocalyptic number.

2121640236433 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2121640236433 is a deficient number, since it is larger than the sum of its proper divisors (231052229999).

2121640236433 is a wasteful number, since it uses less digits than its factorization.

2121640236433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124641 (or 124624 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

Adding to 2121640236433 its reverse (3346320461212), we get a palindrome (5467960697645).

The spelling of 2121640236433 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, two hundred thirty-six thousand, four hundred thirty-three".