21554060 has 24 divisors (see below), whose sum is σ = 49378896. Its totient is φ = 7837760.

The previous prime is 21554041. The next prime is 21554063. The reversal of 21554060 is 6045512.

It is not an unprimeable number, because it can be changed into a prime (21554063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48767 + ... + 49206.

It is an arithmetic number, because the mean of its divisors is an integer number (2057454).

Almost surely, 2^21554060 is an apocalyptic number.

21554060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21554060 is an abundant number, since it is smaller than the sum of its proper divisors (27824836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21554060 is a wasteful number, since it uses less digits than its factorization.

21554060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97993 (or 97991 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 21554060 is about 4642.6350276540. The cubic root of 21554060 is about 278.2977504402.

Adding to 21554060 its reverse (6045512), we get a palindrome (27599572).

The spelling of 21554060 in words is "twenty-one million, five hundred fifty-four thousand, sixty".