210011001021 has 16 divisors (see below), whose sum is σ = 311249473920. Its totient is φ = 139952404800.

The previous prime is 210011000959. The next prime is 210011001043. The reversal of 210011001021 is 120100110012.

It is a happy number.

It is not a de Polignac number, because 210011001021 - 2⁹ = 210011000509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210011000994 and 210011001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210011001061) 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, 1455660 + ... + 1593413.

It is an arithmetic number, because the mean of its divisors is an integer number (19453092120).

Almost surely, 2^210011001021 is an apocalyptic number.

It is an amenable number.

210011001021 is a deficient number, since it is larger than the sum of its proper divisors (101238472899).

210011001021 is a wasteful number, since it uses less digits than its factorization.

210011001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3051633 (or 3051627 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 210011001021 its reverse (120100110012), we get a palindrome (330111111033).

The spelling of 210011001021 in words is "two hundred ten billion, eleven million, one thousand, twenty-one".