21050233541 has 4 divisors (see below), whose sum is σ = 21053702400. Its totient is φ = 21046764684.

The previous prime is 21050233517. The next prime is 21050233619. The reversal of 21050233541 is 14533205012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21050233541 - 2³⁴ = 3870364357 is a prime.

It is a super-2 number, since 2×21050233541² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21050233541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21050230541) 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, 1725311 + ... + 1737468.

It is an arithmetic number, because the mean of its divisors is an integer number (5263425600).

Almost surely, 2^21050233541 is an apocalyptic number.

It is an amenable number.

21050233541 is a deficient number, since it is larger than the sum of its proper divisors (3468859).

21050233541 is an equidigital number, since it uses as much as digits as its factorization.

21050233541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468858.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21050233541 its reverse (14533205012), we get a palindrome (35583438553).

The spelling of 21050233541 in words is "twenty-one billion, fifty million, two hundred thirty-three thousand, five hundred forty-one".