21554351541 has 12 divisors (see below), whose sum is σ = 31139036032. Its totient is φ = 14367272616.

The previous prime is 21554351519. The next prime is 21554351549. The reversal of 21554351541 is 14515345512.

21554351541 is a `hidden beast` number, since 2 + 1 + 554 + 3 + 51 + 54 + 1 = 666.

It is not a de Polignac number, because 21554351541 - 2⁶ = 21554351477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21554351496 and 21554351505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554351549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130771 + ... + 245376.

Almost surely, 2^21554351541 is an apocalyptic number.

It is an amenable number.

21554351541 is a deficient number, since it is larger than the sum of its proper divisors (9584684491).

21554351541 is a wasteful number, since it uses less digits than its factorization.

21554351541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382520 (or 382517 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The spelling of 21554351541 in words is "twenty-one billion, five hundred fifty-four million, three hundred fifty-one thousand, five hundred forty-one".