21001063112 has 8 divisors (see below), whose sum is σ = 39376993350. Its totient is φ = 10500531552.

The previous prime is 21001063099. The next prime is 21001063117. The reversal of 21001063112 is 21136010012.

It can be written as a sum of positive squares in only one way, i.e., 19702613956 + 1298449156 = 140366^2 + 36034^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21001063117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312566437 + ... + 1312566452.

Almost surely, 2^21001063112 is an apocalyptic number.

It is an amenable number.

21001063112 is a deficient number, since it is larger than the sum of its proper divisors (18375930238).

21001063112 is a wasteful number, since it uses less digits than its factorization.

21001063112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625132895 (or 2625132891 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21001063112 its reverse (21136010012), we get a palindrome (42137073124).

The spelling of 21001063112 in words is "twenty-one billion, one million, sixty-three thousand, one hundred twelve".