21240279004 has 12 divisors (see below), whose sum is σ = 42480558064. Its totient is φ = 9102976704.

The previous prime is 21240279001. The next prime is 21240279017. The reversal of 21240279004 is 40097204212.

21240279004 is an admirable number.

It is a super-2 number, since 2×21240279004² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240279001) 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 in 3 ways as a sum of consecutive naturals, for example, 379290669 + ... + 379290724.

Almost surely, 2^21240279004 is an apocalyptic number.

It is an amenable number.

21240279004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21240279004 is a wasteful number, since it uses less digits than its factorization.

21240279004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758581404 (or 758581402 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The spelling of 21240279004 in words is "twenty-one billion, two hundred forty million, two hundred seventy-nine thousand, four".