2100401233421 has 4 divisors (see below), whose sum is σ = 2100404594844. Its totient is φ = 2100397872000.

The previous prime is 2100401233409. The next prime is 2100401233429. The reversal of 2100401233421 is 1243321040012.

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 1328454487396 + 771946746025 = 1152586^2 + 878605^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100401233421 - 2¹⁴ = 2100401217037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100401233429) 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, 436310 + ... + 2095511.

It is an arithmetic number, because the mean of its divisors is an integer number (525101148711).

Almost surely, 2^{2100401233421} is an apocalyptic number.

It is an amenable number.

2100401233421 is a deficient number, since it is larger than the sum of its proper divisors (3361423).

2100401233421 is an equidigital number, since it uses as much as digits as its factorization.

2100401233421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3361422.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2100401233421 its reverse (1243321040012), we get a palindrome (3343722273433).

The spelling of 2100401233421 in words is "two trillion, one hundred billion, four hundred one million, two hundred thirty-three thousand, four hundred twenty-one".