21012442054 has 8 divisors (see below), whose sum is σ = 31540816800. Its totient is φ = 10498836456.

The previous prime is 21012442027. The next prime is 21012442079. The reversal of 21012442054 is 45024421012.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3688729 + ... + 3694420.

It is an arithmetic number, because the mean of its divisors is an integer number (3942602100).

Almost surely, 2^21012442054 is an apocalyptic number.

21012442054 is a deficient number, since it is larger than the sum of its proper divisors (10528374746).

21012442054 is a wasteful number, since it uses less digits than its factorization.

21012442054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7384574.

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 21012442054 its reverse (45024421012), we get a palindrome (66036863066).

The spelling of 21012442054 in words is "twenty-one billion, twelve million, four hundred forty-two thousand, fifty-four".