102213021 has 16 divisors (see below), whose sum is σ = 139825664. Its totient is φ = 66379824.

The previous prime is 102213019. The next prime is 102213037. The reversal of 102213021 is 120312201.

It is not a de Polignac number, because 102213021 - 2¹ = 102213019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 102212988 and 102213006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102213011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62010 + ... + 63636.

It is an arithmetic number, because the mean of its divisors is an integer number (8739104).

Almost surely, 2^102213021 is an apocalyptic number.

It is an amenable number.

102213021 is a deficient number, since it is larger than the sum of its proper divisors (37612643).

102213021 is a wasteful number, since it uses less digits than its factorization.

102213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160.

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

The square root of 102213021 is about 10110.0455488588. The cubic root of 102213021 is about 467.5579094574.

Adding to 102213021 its reverse (120312201), we get a palindrome (222525222).

The spelling of 102213021 in words is "one hundred two million, two hundred thirteen thousand, twenty-one".