21200121240441 has 32 divisors (see below), whose sum is σ = 33209137164672. Its totient is φ = 11860009244160.

The previous prime is 21200121240377. The next prime is 21200121240479. The reversal of 21200121240441 is 14404212100212.

It is a happy number.

It is not a de Polignac number, because 21200121240441 - 2⁶ = 21200121240377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200121940441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27440941 + ... + 28202933.

It is an arithmetic number, because the mean of its divisors is an integer number (1037785536396).

Almost surely, 2^{21200121240441} is an apocalyptic number.

It is an amenable number.

21200121240441 is a deficient number, since it is larger than the sum of its proper divisors (12009015924231).

21200121240441 is a wasteful number, since it uses less digits than its factorization.

21200121240441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826873.

The product of its (nonzero) digits is 1024, while the sum is 24.

Adding to 21200121240441 its reverse (14404212100212), we get a palindrome (35604333340653).

The spelling of 21200121240441 in words is "twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred forty thousand, four hundred forty-one".