21001140554 has 8 divisors (see below), whose sum is σ = 31535991840. Its totient is φ = 10489143276.

The previous prime is 21001140547. The next prime is 21001140577. The reversal of 21001140554 is 45504110012.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5711204 + ... + 5714879.

It is an arithmetic number, because the mean of its divisors is an integer number (3941998980).

Almost surely, 2^21001140554 is an apocalyptic number.

21001140554 is a deficient number, since it is larger than the sum of its proper divisors (10534851286).

21001140554 is a wasteful number, since it uses less digits than its factorization.

21001140554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11427004.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 21001140554 its reverse (45504110012), we get a palindrome (66505250566).

The spelling of 21001140554 in words is "twenty-one billion, one million, one hundred forty thousand, five hundred fifty-four".