21401213121003 has 32 divisors (see below), whose sum is σ = 29349463435776. Its totient is φ = 13863661878528.

The previous prime is 21401213120951. The next prime is 21401213121017. The reversal of 21401213121003 is 30012131210412.

It is a de Polignac number, because none of the positive numbers 2^k-21401213121003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21401213121403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 333564375 + ... + 333628527.

It is an arithmetic number, because the mean of its divisors is an integer number (917170732368).

Almost surely, 2^{21401213121003} is an apocalyptic number.

21401213121003 is a deficient number, since it is larger than the sum of its proper divisors (7948250314773).

21401213121003 is a wasteful number, since it uses less digits than its factorization.

21401213121003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77523.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21401213121003 its reverse (30012131210412), we get a palindrome (51413344331415).

The spelling of 21401213121003 in words is "twenty-one trillion, four hundred one billion, two hundred thirteen million, one hundred twenty-one thousand, three".