21012011012 has 12 divisors (see below), whose sum is σ = 36871215360. Its totient is φ = 10477378056.

The previous prime is 21012010967. The next prime is 21012011051. The reversal of 21012011012 is 21011021012.

It is a junction number, because it is equal to n+sod(n) for n = 21012010984 and 21012011002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7155212 + ... + 7158147.

It is an arithmetic number, because the mean of its divisors is an integer number (3072601280).

Almost surely, 2^21012011012 is an apocalyptic number.

It is an amenable number.

21012011012 is a deficient number, since it is larger than the sum of its proper divisors (15859204348).

21012011012 is a wasteful number, since it uses less digits than its factorization.

21012011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14313730 (or 14313728 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21012011012 its reverse (21011021012), we get a palindrome (42023032024).

The spelling of 21012011012 in words is "twenty-one billion, twelve million, eleven thousand, twelve".