21011012 has 12 divisors (see below), whose sum is σ = 40112016. Its totient is φ = 9550440.

The previous prime is 21011009. The next prime is 21011033.

21011012 is nontrivially palindromic in base 10.

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, 238718 + ... + 238805.

It is an arithmetic number, because the mean of its divisors is an integer number (3342668).

Almost surely, 2^21011012 is an apocalyptic number.

21011012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21011012 is a deficient number, since it is larger than the sum of its proper divisors (19101004).

21011012 is a wasteful number, since it uses less digits than its factorization.

21011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477538 (or 477536 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 21011012 is about 4583.7770451888. Note that the first 3 decimals coincide. The cubic root of 21011012 is about 275.9406334542.

It can be divided in two parts, 2101 and 1012, that multiplied together give a palindrome (2126212).

The spelling of 21011012 in words is "twenty-one million, eleven thousand, twelve".