21211223041 has 4 divisors (see below), whose sum is σ = 21223081300. Its totient is φ = 21199364784.

The previous prime is 21211222961. The next prime is 21211223113. The reversal of 21211223041 is 14032211212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14575491441 + 6635731600 = 120729^2 + 81460^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211223041 - 2⁷ = 21211222913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211223141) 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, 5926446 + ... + 5930023.

It is an arithmetic number, because the mean of its divisors is an integer number (5305770325).

Almost surely, 2^21211223041 is an apocalyptic number.

It is an amenable number.

21211223041 is a deficient number, since it is larger than the sum of its proper divisors (11858259).

21211223041 is a wasteful number, since it uses less digits than its factorization.

21211223041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11858258.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21211223041 its reverse (14032211212), we get a palindrome (35243434253).

The spelling of 21211223041 in words is "twenty-one billion, two hundred eleven million, two hundred twenty-three thousand, forty-one".