21534021541 has 8 divisors (see below), whose sum is σ = 21586428864. Its totient is φ = 21481679520.

The previous prime is 21534021503. The next prime is 21534021589. The reversal of 21534021541 is 14512043512.

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 21534021541 - 2⁷ = 21534021413 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 (21594021541) 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, 679536 + ... + 710518.

It is an arithmetic number, because the mean of its divisors is an integer number (2698303608).

Almost surely, 2^21534021541 is an apocalyptic number.

It is an amenable number.

21534021541 is a deficient number, since it is larger than the sum of its proper divisors (52407323).

21534021541 is an equidigital number, since it uses as much as digits as its factorization.

21534021541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32651.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21534021541 in words is "twenty-one billion, five hundred thirty-four million, twenty-one thousand, five hundred forty-one".