102021 has 8 divisors (see below), whose sum is σ = 140544. Its totient is φ = 65760.

The previous prime is 102019. The next prime is 102023. The reversal of 102021 is 120201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (102019) and next prime (102023).

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

It is not a de Polignac number, because 102021 - 2¹ = 102019 is a prime.

102021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102023) 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, 456 + ... + 641.

It is an arithmetic number, because the mean of its divisors is an integer number (17568).

2¹⁰²⁰²¹ is an apocalyptic number.

It is an amenable number.

102021 is a deficient number, since it is larger than the sum of its proper divisors (38523).

102021 is a wasteful number, since it uses less digits than its factorization.

102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 102021 is about 319.4072635367. The cubic root of 102021 is about 46.7264935636.

Adding to 102021 its reverse (120201), we get a palindrome (222222).

The spelling of 102021 in words is "one hundred two thousand, twenty-one", and thus it is an iban number.