21554115542 has 8 divisors (see below), whose sum is σ = 32353898016. Its totient is φ = 10769482872.

The previous prime is 21554115529. The next prime is 21554115547. The reversal of 21554115542 is 24551145512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554115547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3783893 + ... + 3789584.

It is an arithmetic number, because the mean of its divisors is an integer number (4044237252).

Almost surely, 2^21554115542 is an apocalyptic number.

21554115542 is a deficient number, since it is larger than the sum of its proper divisors (10799782474).

21554115542 is a wasteful number, since it uses less digits than its factorization.

21554115542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7574902.

The product of its digits is 40000, while the sum is 35.

The spelling of 21554115542 in words is "twenty-one billion, five hundred fifty-four million, one hundred fifteen thousand, five hundred forty-two".