102021013 has 4 divisors (see below), whose sum is σ = 107390560. Its totient is φ = 96651468.

The previous prime is 102021001. The next prime is 102021037. The reversal of 102021013 is 310120201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 310120201 = 23 ⋅13483487.

It is a cyclic number.

It is not a de Polignac number, because 102021013 - 2¹³ = 102012821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102021083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2684745 + ... + 2684782.

It is an arithmetic number, because the mean of its divisors is an integer number (26847640).

Almost surely, 2^102021013 is an apocalyptic number.

It is an amenable number.

102021013 is a deficient number, since it is larger than the sum of its proper divisors (5369547).

102021013 is an equidigital number, since it uses as much as digits as its factorization.

102021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5369546.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 102021013 is about 10100.5451833057. The cubic root of 102021013 is about 467.2649554834.

Adding to 102021013 its reverse (310120201), we get a palindrome (412141214).

The spelling of 102021013 in words is "one hundred two million, twenty-one thousand, thirteen".