102021213 has 16 divisors (see below), whose sum is σ = 156119040. Its totient is φ = 58051056.

The previous prime is 102021197. The next prime is 102021251. The reversal of 102021213 is 312120201.

It is not a de Polignac number, because 102021213 - 2⁴ = 102021197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5145 + ... + 15182.

It is an arithmetic number, because the mean of its divisors is an integer number (9757440).

Almost surely, 2^102021213 is an apocalyptic number.

It is an amenable number.

102021213 is a deficient number, since it is larger than the sum of its proper divisors (54097827).

102021213 is a wasteful number, since it uses less digits than its factorization.

102021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20576.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 102021213 is about 10100.5550837565. Note that the first 3 decimals coincide. The cubic root of 102021213 is about 467.2652608222.

Adding to 102021213 its reverse (312120201), we get a palindrome (414141414).

The spelling of 102021213 in words is "one hundred two million, twenty-one thousand, two hundred thirteen".