21642103554 has 8 divisors (see below), whose sum is σ = 43284207120. Its totient is φ = 7214034516.

The previous prime is 21642103531. The next prime is 21642103579. The reversal of 21642103554 is 45530124612.

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

21642103554 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, 1803508624 + ... + 1803508635.

It is an arithmetic number, because the mean of its divisors is an integer number (5410525890).

Almost surely, 2^21642103554 is an apocalyptic number.

21642103554 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.

21642103554 is a wasteful number, since it uses less digits than its factorization.

21642103554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607017264.

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21642103554 in words is "twenty-one billion, six hundred forty-two million, one hundred three thousand, five hundred fifty-four".