21453241250411 has 4 divisors (see below), whose sum is σ = 21694288905000. Its totient is φ = 21212193595824.

The previous prime is 21453241250383. The next prime is 21453241250461. The reversal of 21453241250411 is 11405214235412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21453241250411 - 2³⁰ = 21452167508587 is a prime.

It is a super-2 number, since 2×21453241250411² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21453241250461) 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, 120523827161 + ... + 120523827338.

It is an arithmetic number, because the mean of its divisors is an integer number (5423572226250).

Almost surely, 2^{21453241250411} is an apocalyptic number.

21453241250411 is a deficient number, since it is larger than the sum of its proper divisors (241047654589).

21453241250411 is an equidigital number, since it uses as much as digits as its factorization.

21453241250411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241047654588.

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 21453241250411 its reverse (11405214235412), we get a palindrome (32858455485823).

The spelling of 21453241250411 in words is "twenty-one trillion, four hundred fifty-three billion, two hundred forty-one million, two hundred fifty thousand, four hundred eleven".