201021210210021 has 16 divisors (see below), whose sum is σ = 283051342619136. Its totient is φ = 126643011422576.

The previous prime is 201021210210017. The next prime is 201021210210083. The reversal of 201021210210021 is 120012012120102.

It is a cyclic number.

It is not a de Polignac number, because 201021210210021 - 2² = 201021210210017 is a prime.

It is a super-2 number, since 2×201021210210021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021210210001) 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, 17550300735 + ... + 17550312188.

It is an arithmetic number, because the mean of its divisors is an integer number (17690708913696).

Almost surely, 2^{201021210210021} is an apocalyptic number.

It is an amenable number.

201021210210021 is a deficient number, since it is larger than the sum of its proper divisors (82030132409115).

201021210210021 is a wasteful number, since it uses less digits than its factorization.

201021210210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35100613032.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201021210210021 its reverse (120012012120102), we get a palindrome (321033222330123).

The spelling of 201021210210021 in words is "two hundred one trillion, twenty-one billion, two hundred ten million, two hundred ten thousand, twenty-one".