21541805290 has 32 divisors (see below), whose sum is σ = 40524333696. Its totient is φ = 8229207360.

The previous prime is 21541805287. The next prime is 21541805291. The reversal of 21541805290 is 9250814512.

It is not an unprimeable number, because it can be changed into a prime (21541805291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75060 + ... + 220720.

It is an arithmetic number, because the mean of its divisors is an integer number (1266385428).

Almost surely, 2^21541805290 is an apocalyptic number.

21541805290 is a deficient number, since it is larger than the sum of its proper divisors (18982528406).

21541805290 is a wasteful number, since it uses less digits than its factorization.

21541805290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146334.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 21541805290 in words is "twenty-one billion, five hundred forty-one million, eight hundred five thousand, two hundred ninety".