21343401601 has 4 divisors (see below), whose sum is σ = 21542872752. Its totient is φ = 21143930452.

The previous prime is 21343401559. The next prime is 21343401617. The reversal of 21343401601 is 10610434312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21343401601 - 2⁷ = 21343401473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343401631) 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, 99735415 + ... + 99735628.

It is an arithmetic number, because the mean of its divisors is an integer number (5385718188).

Almost surely, 2^21343401601 is an apocalyptic number.

It is an amenable number.

21343401601 is a deficient number, since it is larger than the sum of its proper divisors (199471151).

21343401601 is a wasteful number, since it uses less digits than its factorization.

21343401601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199471150.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21343401601 its reverse (10610434312), we get a palindrome (31953835913).

The spelling of 21343401601 in words is "twenty-one billion, three hundred forty-three million, four hundred one thousand, six hundred one".