21103554554 has 8 divisors (see below), whose sum is σ = 33517410228. Its totient is φ = 9931084480.

The previous prime is 21103554551. The next prime is 21103554557. The reversal of 21103554554 is 45545530112.

It is an interprime number because it is at equal distance from previous prime (21103554551) and next prime (21103554557).

It can be written as a sum of positive squares in 2 ways, for example, as 20754724225 + 348830329 = 144065^2 + 18677^2 .

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 (21103554551) 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, 310346357 + ... + 310346424.

Almost surely, 2^21103554554 is an apocalyptic number.

21103554554 is a deficient number, since it is larger than the sum of its proper divisors (12413855674).

21103554554 is a wasteful number, since it uses less digits than its factorization.

21103554554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620692800.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 21103554554 in words is "twenty-one billion, one hundred three million, five hundred fifty-four thousand, five hundred fifty-four".