102021011 has 4 divisors (see below), whose sum is σ = 103072872. Its totient is φ = 100969152.

The previous prime is 102021001. The next prime is 102021037. The reversal of 102021011 is 110120201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110120201 = 47 ⋅2342983.

It is a cyclic number.

It is not a de Polignac number, because 102021011 - 2²⁶ = 34912147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102021011.

It is not an unprimeable number, because it can be changed into a prime (102021001) 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, 525785 + ... + 525978.

It is an arithmetic number, because the mean of its divisors is an integer number (25768218).

Almost surely, 2^102021011 is an apocalyptic number.

102021011 is a deficient number, since it is larger than the sum of its proper divisors (1051861).

102021011 is an equidigital number, since it uses as much as digits as its factorization.

102021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051860.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 102021011 is about 10100.5450843011. The cubic root of 102021011 is about 467.2649524300.

Adding to 102021011 its reverse (110120201), we get a palindrome (212141212).

The spelling of 102021011 in words is "one hundred two million, twenty-one thousand, eleven".