2121420352240 has 40 divisors (see below), whose sum is σ = 5636916937440. Its totient is φ = 727344120576.

The previous prime is 2121420352223. The next prime is 2121420352241. The reversal of 2121420352240 is 422530241212.

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

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 2121420352199 and 2121420352208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121420352241) 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, 1894124755 + ... + 1894125874.

It is an arithmetic number, because the mean of its divisors is an integer number (140922923436).

Almost surely, 2^{2121420352240} is an apocalyptic number.

2121420352240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121420352240 is an abundant number, since it is smaller than the sum of its proper divisors (3515496585200).

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

2121420352240 is a wasteful number, since it uses less digits than its factorization.

2121420352240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788250649 (or 3788250643 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 2121420352240 its reverse (422530241212), we get a palindrome (2543950593452).

The spelling of 2121420352240 in words is "two trillion, one hundred twenty-one billion, four hundred twenty million, three hundred fifty-two thousand, two hundred forty".