210012100021 has 8 divisors (see below), whose sum is σ = 213587236800. Its totient is φ = 206437483680.

The previous prime is 210012100019. The next prime is 210012100043. The reversal of 210012100021 is 120001210012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210012100021 - 2¹ = 210012100019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210012099980 and 210012100007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210012100091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732016 + ... + 977686.

It is an arithmetic number, because the mean of its divisors is an integer number (26698404600).

Almost surely, 2^210012100021 is an apocalyptic number.

It is an amenable number.

210012100021 is a deficient number, since it is larger than the sum of its proper divisors (3575136779).

210012100021 is a wasteful number, since it uses less digits than its factorization.

210012100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260219.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210012100021 its reverse (120001210012), we get a palindrome (330013310033).

The spelling of 210012100021 in words is "two hundred ten billion, twelve million, one hundred thousand, twenty-one".