102000220021 has 4 divisors (see below), whose sum is σ = 116571680032. Its totient is φ = 87428760012.

The previous prime is 102000220001. The next prime is 102000220037. The reversal of 102000220021 is 120022000201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 102000220021 - 2⁹ = 102000219509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102000220001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7285729995 + ... + 7285730008.

It is an arithmetic number, because the mean of its divisors is an integer number (29142920008).

Almost surely, 2^102000220021 is an apocalyptic number.

It is an amenable number.

102000220021 is a deficient number, since it is larger than the sum of its proper divisors (14571460011).

102000220021 is an equidigital number, since it uses as much as digits as its factorization.

102000220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14571460010.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 102000220021 its reverse (120022000201), we get a palindrome (222022220222).

The spelling of 102000220021 in words is "one hundred two billion, two hundred twenty thousand, twenty-one".