21245226020411 has 4 divisors (see below), whose sum is σ = 21256957234824. Its totient is φ = 21233494806000.

The previous prime is 21245226020401. The next prime is 21245226020479. The reversal of 21245226020411 is 11402062254212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21245226020411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21245226020401) 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, 5865604490 + ... + 5865608111.

It is an arithmetic number, because the mean of its divisors is an integer number (5314239308706).

Almost surely, 2^{21245226020411} is an apocalyptic number.

21245226020411 is a deficient number, since it is larger than the sum of its proper divisors (11731214413).

21245226020411 is a wasteful number, since it uses less digits than its factorization.

21245226020411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11731214412.

The product of its (nonzero) digits is 15360, while the sum is 32.

Adding to 21245226020411 its reverse (11402062254212), we get a palindrome (32647288274623).

The spelling of 21245226020411 in words is "twenty-one trillion, two hundred forty-five billion, two hundred twenty-six million, twenty thousand, four hundred eleven".