21030411541 has 4 divisors (see below), whose sum is σ = 21120671052. Its totient is φ = 20940152032.

The previous prime is 21030411533. The next prime is 21030411569. The reversal of 21030411541 is 14511403012.

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 9313215025 + 11717196516 = 96505^2 + 108246^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030411541 - 2³ = 21030411533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030411511) 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, 45129406 + ... + 45129871.

It is an arithmetic number, because the mean of its divisors is an integer number (5280167763).

Almost surely, 2^21030411541 is an apocalyptic number.

It is an amenable number.

21030411541 is a deficient number, since it is larger than the sum of its proper divisors (90259511).

21030411541 is an equidigital number, since it uses as much as digits as its factorization.

21030411541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90259510.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21030411541 its reverse (14511403012), we get a palindrome (35541814553).

The spelling of 21030411541 in words is "twenty-one billion, thirty million, four hundred eleven thousand, five hundred forty-one".