21554741 has 8 divisors (see below), whose sum is σ = 23272704. Its totient is φ = 19845360.

The previous prime is 21554737. The next prime is 21554773. The reversal of 21554741 is 14745512.

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

It is a cyclic number.

It is not a de Polignac number, because 21554741 - 2² = 21554737 is a prime.

21554741 is a modest number, since divided by 4741 gives 2155 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21554711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3680 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (2909088).

Almost surely, 2^21554741 is an apocalyptic number.

It is an amenable number.

21554741 is a deficient number, since it is larger than the sum of its proper divisors (1717963).

21554741 is a wasteful number, since it uses less digits than its factorization.

21554741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4291.

The product of its digits is 5600, while the sum is 29.

The square root of 21554741 is about 4642.7083690449. The cubic root of 21554741 is about 278.3006813462.

The spelling of 21554741 in words is "twenty-one million, five hundred fifty-four thousand, seven hundred forty-one".