21101400421403 has 16 divisors (see below), whose sum is σ = 21202357007520. Its totient is φ = 21000702316800.

The previous prime is 21101400421379. The next prime is 21101400421421. The reversal of 21101400421403 is 30412400410112.

It is a cyclic number.

It is not a de Polignac number, because 21101400421403 - 2¹⁰ = 21101400420379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101400421303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1761232673 + ... + 1761244653.

It is an arithmetic number, because the mean of its divisors is an integer number (1325147312970).

Almost surely, 2^{21101400421403} is an apocalyptic number.

21101400421403 is a deficient number, since it is larger than the sum of its proper divisors (100956586117).

21101400421403 is a wasteful number, since it uses less digits than its factorization.

21101400421403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22078.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21101400421403 its reverse (30412400410112), we get a palindrome (51513800831515).

The spelling of 21101400421403 in words is "twenty-one trillion, one hundred one billion, four hundred million, four hundred twenty-one thousand, four hundred three".