21343120401 has 16 divisors (see below), whose sum is σ = 29561990400. Its totient is φ = 13680605568.

The previous prime is 21343120363. The next prime is 21343120417. The reversal of 21343120401 is 10402134312.

It is not a de Polignac number, because 21343120401 - 2¹⁰ = 21343119377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21343120471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492436 + ... + 534021.

It is an arithmetic number, because the mean of its divisors is an integer number (1847624400).

Almost surely, 2^21343120401 is an apocalyptic number.

It is an amenable number.

21343120401 is a deficient number, since it is larger than the sum of its proper divisors (8218869999).

21343120401 is a wasteful number, since it uses less digits than its factorization.

21343120401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026728.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21343120401 its reverse (10402134312), we get a palindrome (31745254713).

The spelling of 21343120401 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty thousand, four hundred one".