240542212421 has 16 divisors (see below), whose sum is σ = 284407872000. Its totient is φ = 199053324288.

The previous prime is 240542212387. The next prime is 240542212433. The reversal of 240542212421 is 124212245042.

It is a de Polignac number, because none of the positive numbers 2^k-240542212421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240542212481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2921780 + ... + 3002978.

It is an arithmetic number, because the mean of its divisors is an integer number (17775492000).

Almost surely, 2^240542212421 is an apocalyptic number.

It is an amenable number.

240542212421 is a deficient number, since it is larger than the sum of its proper divisors (43865659579).

240542212421 is a wasteful number, since it uses less digits than its factorization.

240542212421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95828.

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 240542212421 its reverse (124212245042), we get a palindrome (364754457463).

The spelling of 240542212421 in words is "two hundred forty billion, five hundred forty-two million, two hundred twelve thousand, four hundred twenty-one".