21011231541 has 8 divisors (see below), whose sum is σ = 28035474624. Its totient is φ = 13997238080.

The previous prime is 21011231539. The next prime is 21011231621. The reversal of 21011231541 is 14513211012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21011231541 - 2¹ = 21011231539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011231741) 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, 2557620 + ... + 2565821.

It is an arithmetic number, because the mean of its divisors is an integer number (3504434328).

Almost surely, 2^21011231541 is an apocalyptic number.

It is an amenable number.

21011231541 is a deficient number, since it is larger than the sum of its proper divisors (7024243083).

21011231541 is a wasteful number, since it uses less digits than its factorization.

21011231541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124811.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 21011231541 its reverse (14513211012), we get a palindrome (35524442553).

The spelling of 21011231541 in words is "twenty-one billion, eleven million, two hundred thirty-one thousand, five hundred forty-one".