20202123103021 has 4 divisors (see below), whose sum is σ = 20202705684000. Its totient is φ = 20201540522044.

The previous prime is 20202123102979. The next prime is 20202123103069. The reversal of 20202123103021 is 12030132120202.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20202123103021 is a prime.

It is a super-2 number, since 2×20202123103021² (a number of 27 digits) contains 22 as substring.

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 20202123103021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202123103121) 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, 291238471 + ... + 291307828.

It is an arithmetic number, because the mean of its divisors is an integer number (5050676421000).

Almost surely, 2^{20202123103021} is an apocalyptic number.

It is an amenable number.

20202123103021 is a deficient number, since it is larger than the sum of its proper divisors (582580979).

20202123103021 is an equidigital number, since it uses as much as digits as its factorization.

20202123103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582580978.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 20202123103021 its reverse (12030132120202), we get a palindrome (32232255223223).

The spelling of 20202123103021 in words is "twenty trillion, two hundred two billion, one hundred twenty-three million, one hundred three thousand, twenty-one".