21545120110 has 32 divisors (see below), whose sum is σ = 40858214400. Its totient is φ = 8157290400.

The previous prime is 21545120041. The next prime is 21545120111. The reversal of 21545120110 is 1102154512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21545120111) 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, 169431 + ... + 267949.

It is an arithmetic number, because the mean of its divisors is an integer number (1276819200).

Almost surely, 2^21545120110 is an apocalyptic number.

21545120110 is a deficient number, since it is larger than the sum of its proper divisors (19313094290).

21545120110 is a wasteful number, since it uses less digits than its factorization.

21545120110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99696.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 21545120110 its reverse (1102154512), we get a palindrome (22647274622).

The spelling of 21545120110 in words is "twenty-one billion, five hundred forty-five million, one hundred twenty thousand, one hundred ten".