421010001243 has 64 divisors (see below), whose sum is σ = 683907194880. Its totient is φ = 254404779264.

The previous prime is 421010001173. The next prime is 421010001259. The reversal of 421010001243 is 342100010124.

421010001243 is a `hidden beast` number, since 421 + 0 + 1 + 0 + 0 + 0 + 1 + 243 = 666.

It is not a de Polignac number, because 421010001243 - 2⁸ = 421010000987 is a prime.

It is a super-2 number, since 2×421010001243² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (421010201243) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5780230 + ... + 5852612.

It is an arithmetic number, because the mean of its divisors is an integer number (10686049920).

Almost surely, 2^421010001243 is an apocalyptic number.

421010001243 is a deficient number, since it is larger than the sum of its proper divisors (262897193637).

421010001243 is a wasteful number, since it uses less digits than its factorization.

421010001243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72705 (or 72699 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 421010001243 its reverse (342100010124), we get a palindrome (763110011367).

The spelling of 421010001243 in words is "four hundred twenty-one billion, ten million, one thousand, two hundred forty-three".