102001221021 has 16 divisors (see below), whose sum is σ = 156075379328. Its totient is φ = 58044556800.

The previous prime is 102001221013. The next prime is 102001221037. The reversal of 102001221021 is 120122100201.

It is not a de Polignac number, because 102001221021 - 2³ = 102001221013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102001220988 and 102001221006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001225021) 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, 10072120 + ... + 10082241.

It is an arithmetic number, because the mean of its divisors is an integer number (9754711208).

Almost surely, 2^102001221021 is an apocalyptic number.

It is an amenable number.

102001221021 is a deficient number, since it is larger than the sum of its proper divisors (54074158307).

102001221021 is a wasteful number, since it uses less digits than its factorization.

102001221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20154612.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102001221021 its reverse (120122100201), we get a palindrome (222123321222).

The spelling of 102001221021 in words is "one hundred two billion, one million, two hundred twenty-one thousand, twenty-one".