21499841126401 has 4 divisors (see below), whose sum is σ = 23454372137904. Its totient is φ = 19545310114900.

The previous prime is 21499841126369. The next prime is 21499841126411. The reversal of 21499841126401 is 10462114899412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21499841126401 - 2⁵ = 21499841126369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21499841126411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 977265505735 + ... + 977265505756.

It is an arithmetic number, because the mean of its divisors is an integer number (5863593034476).

Almost surely, 2^{21499841126401} is an apocalyptic number.

It is an amenable number.

21499841126401 is a deficient number, since it is larger than the sum of its proper divisors (1954531011503).

21499841126401 is a wasteful number, since it uses less digits than its factorization.

21499841126401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954531011502.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 21499841126401 in words is "twenty-one trillion, four hundred ninety-nine billion, eight hundred forty-one million, one hundred twenty-six thousand, four hundred one".