10001210021 has 16 divisors (see below), whose sum is σ = 11140720128. Its totient is φ = 8901907200.

The previous prime is 10001210017. The next prime is 10001210027. The reversal of 10001210021 is 12001210001.

It is a cyclic number.

It is not a de Polignac number, because 10001210021 - 2² = 10001210017 is a prime.

It is a Duffinian number.

10001210021 is a modest number, since divided by 210021 gives 10001 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 10001209990 and 10001210008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001210027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64556 + ... + 155466.

It is an arithmetic number, because the mean of its divisors is an integer number (696295008).

Almost surely, 2^10001210021 is an apocalyptic number.

10001210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10001210021 is a deficient number, since it is larger than the sum of its proper divisors (1139510107).

10001210021 is a wasteful number, since it uses less digits than its factorization.

10001210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91132.

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

Adding to 10001210021 its reverse (12001210001), we get a palindrome (22002420022).

It can be divided in two parts, 10001 and 210021, that added together give a palindrome (220022).

The spelling of 10001210021 in words is "ten billion, one million, two hundred ten thousand, twenty-one".