21220120143240 has 128 divisors (see below), whose sum is σ = 63744966835200. Its totient is φ = 5651180421120.

The previous prime is 21220120143221. The next prime is 21220120143263. The reversal of 21220120143240 is 4234102102212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21220120143240.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 775547160 + ... + 775574520.

It is an arithmetic number, because the mean of its divisors is an integer number (498007553400).

Almost surely, 2^{21220120143240} is an apocalyptic number.

21220120143240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220120143240 is an abundant number, since it is smaller than the sum of its proper divisors (42524846691960).

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

21220120143240 is a wasteful number, since it uses less digits than its factorization.

21220120143240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35727 (or 35723 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21220120143240 its reverse (4234102102212), we get a palindrome (25454222245452).

The spelling of 21220120143240 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, one hundred forty-three thousand, two hundred forty".