102122021 has 8 divisors (see below), whose sum is σ = 108221400. Its totient is φ = 96194560.

The previous prime is 102122011. The next prime is 102122039. The reversal of 102122021 is 120221201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17757796 + 84364225 = 4214^2 + 9185^2 .

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-102122021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102121993 and 102122011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102122011) 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, 41756 + ... + 44133.

It is an arithmetic number, because the mean of its divisors is an integer number (13527675).

Almost surely, 2^102122021 is an apocalyptic number.

It is an amenable number.

102122021 is a deficient number, since it is larger than the sum of its proper divisors (6099379).

102122021 is an equidigital number, since it uses as much as digits as its factorization.

102122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85959.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 102122021 is about 10105.5440724387. The cubic root of 102122021 is about 467.4191130421.

Adding to 102122021 its reverse (120221201), we get a palindrome (222343222).

The spelling of 102122021 in words is "one hundred two million, one hundred twenty-two thousand, twenty-one".