101921830121 has 4 divisors (see below), whose sum is σ = 102491226000. Its totient is φ = 101352434244.

The previous prime is 101921830097. The next prime is 101921830133. The reversal of 101921830121 is 121038129101.

It is a happy number.

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 not a de Polignac number, because 101921830121 - 2¹⁴ = 101921813737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101921830151) 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, 284697671 + ... + 284698028.

It is an arithmetic number, because the mean of its divisors is an integer number (25622806500).

Almost surely, 2^101921830121 is an apocalyptic number.

It is an amenable number.

101921830121 is a deficient number, since it is larger than the sum of its proper divisors (569395879).

101921830121 is an equidigital number, since it uses as much as digits as its factorization.

101921830121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569395878.

The product of its (nonzero) digits is 864, while the sum is 29.

Adding to 101921830121 its reverse (121038129101), we get a palindrome (222959959222).

The spelling of 101921830121 in words is "one hundred one billion, nine hundred twenty-one million, eight hundred thirty thousand, one hundred twenty-one".