21000000001004 has 12 divisors (see below), whose sum is σ = 36934673370000. Its totient is φ = 10447236181008.

The previous prime is 21000000001003. The next prime is 21000000001027. The reversal of 21000000001004 is 40010000000012.

It is a junction number, because it is equal to n+sod(n) for n = 21000000000982 and 21000000001000.

It is not an unprimeable number, because it can be changed into a prime (21000000001003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13190953979 + ... + 13190955570.

It is an arithmetic number, because the mean of its divisors is an integer number (3077889447500).

Almost surely, 2^{21000000001004} is an apocalyptic number.

It is an amenable number.

21000000001004 is a deficient number, since it is larger than the sum of its proper divisors (15934673368996).

21000000001004 is a wasteful number, since it uses less digits than its factorization.

21000000001004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26381909752 (or 26381909750 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 21000000001004 its reverse (40010000000012), we get a palindrome (61010000001016).

The spelling of 21000000001004 in words is "twenty-one trillion, one thousand, four".