21236140004 has 6 divisors (see below), whose sum is σ = 37163245014. Its totient is φ = 10618070000.

The previous prime is 21236139907. The next prime is 21236140007. The reversal of 21236140004 is 40004163212.

It can be written as a sum of positive squares in only one way, i.e., 19421209600 + 1814930404 = 139360^2 + 42602^2 .

It is not an unprimeable number, because it can be changed into a prime (21236140007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2654517497 + ... + 2654517504.

It is an arithmetic number, because the mean of its divisors is an integer number (6193874169).

Almost surely, 2^21236140004 is an apocalyptic number.

It is an amenable number.

21236140004 is a deficient number, since it is larger than the sum of its proper divisors (15927105010).

21236140004 is a wasteful number, since it uses less digits than its factorization.

21236140004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309035005 (or 5309035003 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The spelling of 21236140004 in words is "twenty-one billion, two hundred thirty-six million, one hundred forty thousand, four".