21550540402 has 8 divisors (see below), whose sum is σ = 32572572912. Its totient is φ = 10693016100.

The previous prime is 21550540397. The next prime is 21550540409. The reversal of 21550540402 is 20404505512.

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

It is not an unprimeable number, because it can be changed into a prime (21550540409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41126724 + ... + 41127247.

It is an arithmetic number, because the mean of its divisors is an integer number (4071571614).

Almost surely, 2^21550540402 is an apocalyptic number.

21550540402 is a deficient number, since it is larger than the sum of its proper divisors (11022032510).

21550540402 is a wasteful number, since it uses less digits than its factorization.

21550540402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82254104.

The product of its (nonzero) digits is 8000, while the sum is 28.

The spelling of 21550540402 in words is "twenty-one billion, five hundred fifty million, five hundred forty thousand, four hundred two".