21101105040 has 40 divisors (see below), whose sum is σ = 65413426368. Its totient is φ = 5626961280.

The previous prime is 21101104957. The next prime is 21101105057. The reversal of 21101105040 is 4050110112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21101105040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43960396 + ... + 43960875.

Almost surely, 2^21101105040 is an apocalyptic number.

21101105040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101105040 is an abundant number, since it is smaller than the sum of its proper divisors (44312321328).

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

21101105040 is a wasteful number, since it uses less digits than its factorization.

21101105040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87921287 (or 87921281 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 21101105040 its reverse (4050110112), we get a palindrome (25151215152).

The spelling of 21101105040 in words is "twenty-one billion, one hundred one million, one hundred five thousand, forty".