210120101000001 has 16 divisors (see below), whose sum is σ = 311300239897920. Its totient is φ = 140075026712640.

The previous prime is 210120100999969. The next prime is 210120101000003. The reversal of 210120101000001 is 100000101021012.

It is a happy number.

It is not a de Polignac number, because 210120101000001 - 2⁵ = 210120100999969 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 (210120101000003) 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, 139252935 + ... + 140753756.

It is an arithmetic number, because the mean of its divisors is an integer number (19456264993620).

Almost surely, 2^{210120101000001} is an apocalyptic number.

It is an amenable number.

210120101000001 is a deficient number, since it is larger than the sum of its proper divisors (101180138897919).

210120101000001 is a wasteful number, since it uses less digits than its factorization.

210120101000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280034493 (or 280034487 counting only the distinct ones).

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

Adding to 210120101000001 its reverse (100000101021012), we get a palindrome (310120202021013).

The spelling of 210120101000001 in words is "two hundred ten trillion, one hundred twenty billion, one hundred one million, one", and thus it is an aban number.