101203123421 has 4 divisors (see below), whose sum is σ = 101203831200. Its totient is φ = 101202415644.

The previous prime is 101203123403. The next prime is 101203123429. The reversal of 101203123421 is 124321302101.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 124321302101 = 90437 ⋅1374673.

It is a cyclic number.

It is not a de Polignac number, because 101203123421 - 2¹⁴ = 101203107037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101203123393 and 101203123402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101203123429) 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 in 3 ways as a sum of consecutive naturals, for example, 55601 + ... + 453318.

It is an arithmetic number, because the mean of its divisors is an integer number (25300957800).

Almost surely, 2^101203123421 is an apocalyptic number.

It is an amenable number.

101203123421 is a deficient number, since it is larger than the sum of its proper divisors (707779).

101203123421 is an equidigital number, since it uses as much as digits as its factorization.

101203123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707778.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 101203123421 its reverse (124321302101), we get a palindrome (225524425522).

The spelling of 101203123421 in words is "one hundred one billion, two hundred three million, one hundred twenty-three thousand, four hundred twenty-one".