21143213421001 has 24 divisors (see below), whose sum is σ = 24633422127360. Its totient is φ = 18094582814112.

The previous prime is 21143213420981. The next prime is 21143213421013. The reversal of 21143213421001 is 10012431234112.

It is not a de Polignac number, because 21143213421001 - 2⁹ = 21143213420489 is a prime.

It is a super-3 number, since 3×21143213421001³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21143213424001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108030090 + ... + 108225628.

It is an arithmetic number, because the mean of its divisors is an integer number (1026392588640).

Almost surely, 2^{21143213421001} is an apocalyptic number.

It is an amenable number.

21143213421001 is a deficient number, since it is larger than the sum of its proper divisors (3490208706359).

21143213421001 is a wasteful number, since it uses less digits than its factorization.

21143213421001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198973 (or 198966 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 21143213421001 its reverse (10012431234112), we get a palindrome (31155644655113).

The spelling of 21143213421001 in words is "twenty-one trillion, one hundred forty-three billion, two hundred thirteen million, four hundred twenty-one thousand, one".