21212020041 has 16 divisors (see below), whose sum is σ = 29594979840. Its totient is φ = 13497701760.

The previous prime is 21212020021. The next prime is 21212020087. The reversal of 21212020041 is 14002021212.

It is not a de Polignac number, because 21212020041 - 2⁵ = 21212020009 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21212020041.

It is not an unprimeable number, because it can be changed into a prime (21212020001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1555446 + ... + 1569023.

It is an arithmetic number, because the mean of its divisors is an integer number (1849686240).

Almost surely, 2^21212020041 is an apocalyptic number.

It is an amenable number.

21212020041 is a deficient number, since it is larger than the sum of its proper divisors (8382959799).

21212020041 is a wasteful number, since it uses less digits than its factorization.

21212020041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3124576.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212020041 its reverse (14002021212), we get a palindrome (35214041253).

The spelling of 21212020041 in words is "twenty-one billion, two hundred twelve million, twenty thousand, forty-one".