21542541411 has 32 divisors (see below), whose sum is σ = 30884071680. Its totient is φ = 13316659200.

The previous prime is 21542541409. The next prime is 21542541473. The reversal of 21542541411 is 11414524512.

It is not a de Polignac number, because 21542541411 - 2¹ = 21542541409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21542541401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 525331 + ... + 564851.

It is an arithmetic number, because the mean of its divisors is an integer number (965127240).

Almost surely, 2^21542541411 is an apocalyptic number.

21542541411 is a deficient number, since it is larger than the sum of its proper divisors (9341530269).

21542541411 is a wasteful number, since it uses less digits than its factorization.

21542541411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39747.

The product of its digits is 6400, while the sum is 30.

The spelling of 21542541411 in words is "twenty-one billion, five hundred forty-two million, five hundred forty-one thousand, four hundred eleven".