201012101021 has 4 divisors (see below), whose sum is σ = 201794249532. Its totient is φ = 200229952512.

The previous prime is 201012101009. The next prime is 201012101027. The reversal of 201012101021 is 120101210102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 193393255225 + 7618845796 = 439765^2 + 87286^2 .

It is a cyclic number.

It is not a de Polignac number, because 201012101021 - 2⁶ = 201012100957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201012100993 and 201012101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201012101027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391073870 + ... + 391074383.

It is an arithmetic number, because the mean of its divisors is an integer number (50448562383).

Almost surely, 2^201012101021 is an apocalyptic number.

It is an amenable number.

201012101021 is a deficient number, since it is larger than the sum of its proper divisors (782148511).

201012101021 is an equidigital number, since it uses as much as digits as its factorization.

201012101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782148510.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 201012101021 its reverse (120101210102), we get a palindrome (321113311123).

The spelling of 201012101021 in words is "two hundred one billion, twelve million, one hundred one thousand, twenty-one".