102111202220021 has 8 divisors (see below), whose sum is σ = 106555087289664. Its totient is φ = 97667672782240.

The previous prime is 102111202219907. The next prime is 102111202220039. The reversal of 102111202220021 is 120022202111201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102111202220021 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 (102111202220081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88321136 + ... + 89469801.

It is an arithmetic number, because the mean of its divisors is an integer number (13319385911208).

Almost surely, 2^{102111202220021} is an apocalyptic number.

It is an amenable number.

102111202220021 is a deficient number, since it is larger than the sum of its proper divisors (4443885069643).

102111202220021 is a wasteful number, since it uses less digits than its factorization.

102111202220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177815931.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102111202220021 its reverse (120022202111201), we get a palindrome (222133404331222).

The spelling of 102111202220021 in words is "one hundred two trillion, one hundred eleven billion, two hundred two million, two hundred twenty thousand, twenty-one".