2121640236401 has 8 divisors (see below), whose sum is σ = 2433007235904. Its totient is φ = 1812342121200.

The previous prime is 2121640236389. The next prime is 2121640236409. The reversal of 2121640236401 is 1046320461212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121640236401 - 2⁶ = 2121640236337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121640236409) 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, 517218875 + ... + 517222976.

It is an arithmetic number, because the mean of its divisors is an integer number (304125904488).

Almost surely, 2^{2121640236401} is an apocalyptic number.

It is an amenable number.

2121640236401 is a deficient number, since it is larger than the sum of its proper divisors (311366999503).

2121640236401 is a wasteful number, since it uses less digits than its factorization.

2121640236401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034442151.

The product of its (nonzero) digits is 13824, while the sum is 32.

Adding to 2121640236401 its reverse (1046320461212), we get a palindrome (3167960697613).

The spelling of 2121640236401 in words is "two trillion, one hundred twenty-one billion, six hundred forty million, two hundred thirty-six thousand, four hundred one".