21202221041 has 4 divisors (see below), whose sum is σ = 22449410532. Its totient is φ = 19955031552.

The previous prime is 21202221017. The next prime is 21202221091. The reversal of 21202221041 is 14012220212.

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 12877483441 + 8324737600 = 113479^2 + 91240^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202221041 - 2¹⁴ = 21202204657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 1247189473 = 21202221041 / (2 + 1 + 2 + 0 + 2 + 2 + 2 + 1 + 0 + 4 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21202221091) 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, 623594720 + ... + 623594753.

It is an arithmetic number, because the mean of its divisors is an integer number (5612352633).

Almost surely, 2^21202221041 is an apocalyptic number.

It is an amenable number.

21202221041 is a deficient number, since it is larger than the sum of its proper divisors (1247189491).

21202221041 is a wasteful number, since it uses less digits than its factorization.

21202221041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247189490.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202221041 its reverse (14012220212), we get a palindrome (35214441253).

The spelling of 21202221041 in words is "twenty-one billion, two hundred two million, two hundred twenty-one thousand, forty-one".