21554041502 has 24 divisors (see below), whose sum is σ = 37649901744. Its totient is φ = 9227548512.

The previous prime is 21554041471. The next prime is 21554041507. The reversal of 21554041502 is 20514045512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554041507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25538 + ... + 209189.

It is an arithmetic number, because the mean of its divisors is an integer number (1568745906).

Almost surely, 2^21554041502 is an apocalyptic number.

21554041502 is a deficient number, since it is larger than the sum of its proper divisors (16095860242).

21554041502 is a wasteful number, since it uses less digits than its factorization.

21554041502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235680 (or 235673 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 21554041502 in words is "twenty-one billion, five hundred fifty-four million, forty-one thousand, five hundred two".