21034501451321 has 4 divisors (see below), whose sum is σ = 21078414816000. Its totient is φ = 20990588086644.

The previous prime is 21034501451297. The next prime is 21034501451329. The reversal of 21034501451321 is 12315410543012.

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 21034501451321 - 2²² = 21034497257017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21034501451329) 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, 21956681621 + ... + 21956682578.

It is an arithmetic number, because the mean of its divisors is an integer number (5269603704000).

Almost surely, 2^{21034501451321} is an apocalyptic number.

It is an amenable number.

21034501451321 is a deficient number, since it is larger than the sum of its proper divisors (43913364679).

21034501451321 is an equidigital number, since it uses as much as digits as its factorization.

21034501451321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43913364678.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21034501451321 its reverse (12315410543012), we get a palindrome (33349911994333).

The spelling of 21034501451321 in words is "twenty-one trillion, thirty-four billion, five hundred one million, four hundred fifty-one thousand, three hundred twenty-one".