102021021221 has 24 divisors (see below), whose sum is σ = 121950925824. Its totient is φ = 83594750400.

The previous prime is 102021021217. The next prime is 102021021233. The reversal of 102021021221 is 122120120201.

It is not a de Polignac number, because 102021021221 - 2² = 102021021217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102021021196 and 102021021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021021251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 508796 + ... + 680378.

It is an arithmetic number, because the mean of its divisors is an integer number (5081288576).

Almost surely, 2^102021021221 is an apocalyptic number.

It is an amenable number.

102021021221 is a deficient number, since it is larger than the sum of its proper divisors (19929904603).

102021021221 is a wasteful number, since it uses less digits than its factorization.

102021021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171749 (or 171720 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102021021221 its reverse (122120120201), we get a palindrome (224141141422).

The spelling of 102021021221 in words is "one hundred two billion, twenty-one million, twenty-one thousand, two hundred twenty-one".