21031212041 has 8 divisors (see below), whose sum is σ = 24526195200. Its totient is φ = 18026752884.

The previous prime is 21031212011. The next prime is 21031212049. The reversal of 21031212041 is 14021213012.

It is not a de Polignac number, because 21031212041 - 2²⁶ = 20964103177 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 (21031212049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30657401 + ... + 30658086.

It is an arithmetic number, because the mean of its divisors is an integer number (3065774400).

Almost surely, 2^21031212041 is an apocalyptic number.

It is an amenable number.

21031212041 is a deficient number, since it is larger than the sum of its proper divisors (3494983159).

21031212041 is an frugal number, since it uses more digits than its factorization.

21031212041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61315508 (or 61315494 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21031212041 its reverse (14021213012), we get a palindrome (35052425053).

The spelling of 21031212041 in words is "twenty-one billion, thirty-one million, two hundred twelve thousand, forty-one".