21542533554 has 8 divisors (see below), whose sum is σ = 43085067120. Its totient is φ = 7180844516.

The previous prime is 21542533531. The next prime is 21542533589. The reversal of 21542533554 is 45533524512.

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

21542533554 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1795211124 + ... + 1795211135.

It is an arithmetic number, because the mean of its divisors is an integer number (5385633390).

Almost surely, 2^21542533554 is an apocalyptic number.

21542533554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21542533554 is a wasteful number, since it uses less digits than its factorization.

21542533554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3590422264.

The product of its digits is 360000, while the sum is 39.

The spelling of 21542533554 in words is "twenty-one billion, five hundred forty-two million, five hundred thirty-three thousand, five hundred fifty-four".