21031102011440 has 40 divisors (see below), whose sum is σ = 48947360784480. Its totient is φ = 8403830291456.

The previous prime is 21031102011433. The next prime is 21031102011463. The reversal of 21031102011440 is 4411020113012.

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

It is a super-2 number, since 2×21031102011440² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 134460620 + ... + 134616939.

It is an arithmetic number, because the mean of its divisors is an integer number (1223684019612).

Almost surely, 2^{21031102011440} is an apocalyptic number.

21031102011440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031102011440 is an abundant number, since it is smaller than the sum of its proper divisors (27916258773040).

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

21031102011440 is a wasteful number, since it uses less digits than its factorization.

21031102011440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269078549 (or 269078543 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21031102011440 its reverse (4411020113012), we get a palindrome (25442122124452).

The spelling of 21031102011440 in words is "twenty-one trillion, thirty-one billion, one hundred two million, eleven thousand, four hundred forty".