21240111121340 has 24 divisors (see below), whose sum is σ = 44676997219680. Its totient is φ = 8482184664768.

The previous prime is 21240111121337. The next prime is 21240111121351. The reversal of 21240111121340 is 4312111104212.

It is a super-2 number, since 2×21240111121340² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

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, 866223920 + ... + 866248439.

It is an arithmetic number, because the mean of its divisors is an integer number (1861541550820).

Almost surely, 2^{21240111121340} is an apocalyptic number.

21240111121340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21240111121340 is an abundant number, since it is smaller than the sum of its proper divisors (23436886098340).

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

21240111121340 is a wasteful number, since it uses less digits than its factorization.

21240111121340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732472981 (or 1732472979 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21240111121340 its reverse (4312111104212), we get a palindrome (25552222225552).

The spelling of 21240111121340 in words is "twenty-one trillion, two hundred forty billion, one hundred eleven million, one hundred twenty-one thousand, three hundred forty".