102021212020021 has 12 divisors (see below), whose sum is σ = 121437683792832. Its totient is φ = 85413107735928.

The previous prime is 102021212019973. The next prime is 102021212020027. The reversal of 102021212020021 is 120020212120201.

It is a happy number.

It is not a de Polignac number, because 102021212020021 - 2³¹ = 102019064536373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102021212019977 and 102021212020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021212020027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24210062445 + ... + 24210066658.

It is an arithmetic number, because the mean of its divisors is an integer number (10119806982736).

Almost surely, 2^{102021212020021} is an apocalyptic number.

It is an amenable number.

102021212020021 is a deficient number, since it is larger than the sum of its proper divisors (19416471772811).

102021212020021 is an equidigital number, since it uses as much as digits as its factorization.

102021212020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48420129160 (or 48420129153 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102021212020021 its reverse (120020212120201), we get a palindrome (222041424140222).

The spelling of 102021212020021 in words is "one hundred two trillion, twenty-one billion, two hundred twelve million, twenty thousand, twenty-one".