21554854424 has 8 divisors (see below), whose sum is σ = 40415352060. Its totient is φ = 10777427208.

The previous prime is 21554854379. The next prime is 21554854439. The reversal of 21554854424 is 42445845512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21554854424² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1347178394 + ... + 1347178409.

Almost surely, 2^21554854424 is an apocalyptic number.

It is an amenable number.

21554854424 is a deficient number, since it is larger than the sum of its proper divisors (18860497636).

21554854424 is a wasteful number, since it uses less digits than its factorization.

21554854424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694356809 (or 2694356805 counting only the distinct ones).

The product of its digits is 1024000, while the sum is 44.

The spelling of 21554854424 in words is "twenty-one billion, five hundred fifty-four million, eight hundred fifty-four thousand, four hundred twenty-four".