21010423204 has 24 divisors (see below), whose sum is σ = 36842400000. Its totient is φ = 10484048640.

The previous prime is 21010423201. The next prime is 21010423243. The reversal of 21010423204 is 40232401012.

It is a super-2 number, since 2×21010423204² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21010423201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5148837 + ... + 5152915.

It is an arithmetic number, because the mean of its divisors is an integer number (1535100000).

Almost surely, 2^21010423204 is an apocalyptic number.

It is an amenable number.

21010423204 is a deficient number, since it is larger than the sum of its proper divisors (15831976796).

21010423204 is a wasteful number, since it uses less digits than its factorization.

21010423204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6363 (or 6361 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21010423204 its reverse (40232401012), we get a palindrome (61242824216).

The spelling of 21010423204 in words is "twenty-one billion, ten million, four hundred twenty-three thousand, two hundred four".