20231021102 has 4 divisors (see below), whose sum is σ = 30346531656. Its totient is φ = 10115510550.

The previous prime is 20231021101. The next prime is 20231021149. The reversal of 20231021102 is 20112013202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20112013202 = 2 ⋅10056006601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231021101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5057755274 + ... + 5057755277.

It is an arithmetic number, because the mean of its divisors is an integer number (7586632914).

Almost surely, 2^20231021102 is an apocalyptic number.

20231021102 is a deficient number, since it is larger than the sum of its proper divisors (10115510554).

20231021102 is a wasteful number, since it uses less digits than its factorization.

20231021102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10115510553.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20231021102 its reverse (20112013202), we get a palindrome (40343034304).

The spelling of 20231021102 in words is "twenty billion, two hundred thirty-one million, twenty-one thousand, one hundred two".