210001021021 has 8 divisors (see below), whose sum is σ = 229102632864. Its totient is φ = 190901177520.

The previous prime is 210001021019. The next prime is 210001021031. The reversal of 210001021021 is 120120100012.

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 210001021021 - 2¹ = 210001021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210001020989 and 210001021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001021031) 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, 187390 + ... + 674623.

It is an arithmetic number, because the mean of its divisors is an integer number (28637829108).

Almost surely, 2^210001021021 is an apocalyptic number.

It is an amenable number.

210001021021 is a deficient number, since it is larger than the sum of its proper divisors (19101611843).

210001021021 is a wasteful number, since it uses less digits than its factorization.

210001021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884171.

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

Adding to 210001021021 its reverse (120120100012), we get a palindrome (330121121033).

The spelling of 210001021021 in words is "two hundred ten billion, one million, twenty-one thousand, twenty-one".