210021010100001 has 24 divisors (see below), whose sum is σ = 303410457732096. Its totient is φ = 139992419115360.

The previous prime is 210021010099961. The next prime is 210021010100047. The reversal of 210021010100001 is 100001010120012.

It is a happy number.

It is not a de Polignac number, because 210021010100001 - 2⁹ = 210021010099489 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (210021010108001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2333962656 + ... + 2334052638.

It is an arithmetic number, because the mean of its divisors is an integer number (12642102405504).

Almost surely, 2^{210021010100001} is an apocalyptic number.

It is an amenable number.

210021010100001 is a deficient number, since it is larger than the sum of its proper divisors (93389447632095).

210021010100001 is a wasteful number, since it uses less digits than its factorization.

210021010100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127093 (or 127090 counting only the distinct ones).

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

Adding to 210021010100001 its reverse (100001010120012), we get a palindrome (310022020220013).

The spelling of 210021010100001 in words is "two hundred ten trillion, twenty-one billion, ten million, one hundred thousand, one".