21145101110440 has 32 divisors (see below), whose sum is σ = 47706113710080. Its totient is φ = 8434994006592.

The previous prime is 21145101110401. The next prime is 21145101110443. The reversal of 21145101110440 is 4401110154112.

It is not an unprimeable number, because it can be changed into a prime (21145101110443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 720186312 + ... + 720215671.

It is an arithmetic number, because the mean of its divisors is an integer number (1490816053440).

Almost surely, 2^{21145101110440} is an apocalyptic number.

21145101110440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21145101110440 is an abundant number, since it is smaller than the sum of its proper divisors (26561012599640).

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

21145101110440 is a wasteful number, since it uses less digits than its factorization.

21145101110440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440402361 (or 1440402357 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

Adding to 21145101110440 its reverse (4401110154112), we get a palindrome (25546211264552).

The spelling of 21145101110440 in words is "twenty-one trillion, one hundred forty-five billion, one hundred one million, one hundred ten thousand, four hundred forty".