2111646003421 has 4 divisors (see below), whose sum is σ = 2135372363100. Its totient is φ = 2087919643744.

The previous prime is 2111646003409. The next prime is 2111646003431. The reversal of 2111646003421 is 1243006461112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1077265471396 + 1034380532025 = 1037914^2 + 1017045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111646003421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111646003431) 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, 11863179706 + ... + 11863179883.

It is an arithmetic number, because the mean of its divisors is an integer number (533843090775).

Almost surely, 2^{2111646003421} is an apocalyptic number.

It is an amenable number.

2111646003421 is a deficient number, since it is larger than the sum of its proper divisors (23726359679).

2111646003421 is an equidigital number, since it uses as much as digits as its factorization.

2111646003421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23726359678.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 2111646003421 in words is "two trillion, one hundred eleven billion, six hundred forty-six million, three thousand, four hundred twenty-one".