21554255026 has 16 divisors (see below), whose sum is σ = 32471076960. Its totient is φ = 10730592000.

The previous prime is 21554255003. The next prime is 21554255027. The reversal of 21554255026 is 62055245512.

It is not an unprimeable number, because it can be changed into a prime (21554255027) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2112850 + ... + 2123026.

It is an arithmetic number, because the mean of its divisors is an integer number (2029442310).

Almost surely, 2^21554255026 is an apocalyptic number.

21554255026 is a deficient number, since it is larger than the sum of its proper divisors (10916821934).

21554255026 is a wasteful number, since it uses less digits than its factorization.

21554255026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14649.

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 21554255026 in words is "twenty-one billion, five hundred fifty-four million, two hundred fifty-five thousand, twenty-six".