102001021 has 8 divisors (see below), whose sum is σ = 107216064. Its totient is φ = 96851040.

The previous prime is 102001007. The next prime is 102001027. The reversal of 102001021 is 120100201.

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

It is a cyclic number.

It is not a de Polignac number, because 102001021 - 2²³ = 93612413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102000995 and 102001013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102001027) 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, 13035 + ... + 19336.

It is an arithmetic number, because the mean of its divisors is an integer number (13402008).

Almost surely, 2^102001021 is an apocalyptic number.

It is an amenable number.

102001021 is a deficient number, since it is larger than the sum of its proper divisors (5215043).

102001021 is a wasteful number, since it uses less digits than its factorization.

102001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32531.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 102001021 is about 10099.5554852677. Note that the first 3 decimals coincide. The cubic root of 102001021 is about 467.2344318001.

Adding to 102001021 its reverse (120100201), we get a palindrome (222101222).

The spelling of 102001021 in words is "one hundred two million, one thousand, twenty-one".