1240423420221 has 12 divisors (see below), whose sum is σ = 1793651387580. Its totient is φ = 826058791680.

The previous prime is 1240423420207. The next prime is 1240423420273. The reversal of 1240423420221 is 1220243240421.

It is a happy number.

1240423420221 is a `hidden beast` number, since 1 + 2 + 404 + 2 + 34 + 2 + 0 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 59104416996 + 1181319003225 = 243114^2 + 1086885^2 .

It is not a de Polignac number, because 1240423420221 - 2⁶ = 1240423420157 is a prime.

It is a super-2 number, since 2×1240423420221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240423420321) 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 11 ways as a sum of consecutive naturals, for example, 74170770 + ... + 74187491.

It is an arithmetic number, because the mean of its divisors is an integer number (149470948965).

Almost surely, 2^{1240423420221} is an apocalyptic number.

It is an amenable number.

1240423420221 is a deficient number, since it is larger than the sum of its proper divisors (553227967359).

1240423420221 is a wasteful number, since it uses less digits than its factorization.

1240423420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148359196 (or 148359193 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 1240423420221 its reverse (1220243240421), we get a palindrome (2460666660642).

The spelling of 1240423420221 in words is "one trillion, two hundred forty billion, four hundred twenty-three million, four hundred twenty thousand, two hundred twenty-one".