243724070421 has 40 divisors (see below), whose sum is σ = 393024397920. Its totient is φ = 149625815328.

The previous prime is 243724070419. The next prime is 243724070437. The reversal of 243724070421 is 124070427342.

243724070421 is a `hidden beast` number, since 243 + 7 + 2 + 407 + 0 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 243724070421 - 2¹ = 243724070419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243724070621) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 165006 + ... + 717408.

It is an arithmetic number, because the mean of its divisors is an integer number (9825609948).

Almost surely, 2^243724070421 is an apocalyptic number.

It is an amenable number.

243724070421 is a deficient number, since it is larger than the sum of its proper divisors (149300327499).

243724070421 is a wasteful number, since it uses less digits than its factorization.

243724070421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552847 (or 552838 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

Adding to 243724070421 its reverse (124070427342), we get a palindrome (367794497763).

The spelling of 243724070421 in words is "two hundred forty-three billion, seven hundred twenty-four million, seventy thousand, four hundred twenty-one".