102001210210021 has 6 divisors (see below), whose sum is σ = 102630823638630. Its totient is φ = 101375435887848.

The previous prime is 102001210210019. The next prime is 102001210210037. The reversal of 102001210210021 is 120012012100201.

It can be written as a sum of positive squares in only one way, i.e., 94092522016900 + 7908688193121 = 9700130^2 + 2812239^2 .

It is not a de Polignac number, because 102001210210021 - 2¹ = 102001210210019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102001210209983 and 102001210210010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001210210061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1919526486 + ... + 1919579623.

It is an arithmetic number, because the mean of its divisors is an integer number (17105137273105).

Almost surely, 2^{102001210210021} is an apocalyptic number.

It is an amenable number.

102001210210021 is a deficient number, since it is larger than the sum of its proper divisors (629613428609).

102001210210021 is an frugal number, since it uses more digits than its factorization.

102001210210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3839106435 (or 3839106272 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 102001210210021 its reverse (120012012100201), we get a palindrome (222013222310222).

The spelling of 102001210210021 in words is "one hundred two trillion, one billion, two hundred ten million, two hundred ten thousand, twenty-one".