102121001110021 has 4 divisors (see below), whose sum is σ = 102121476839200. Its totient is φ = 102120525380844.

The previous prime is 102121001110013. The next prime is 102121001110039. The reversal of 102121001110021 is 120011100121201.

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 102121001110021 - 2³ = 102121001110013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102121001109983 and 102121001110010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102121001110321) 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, 237542451 + ... + 237971968.

It is an arithmetic number, because the mean of its divisors is an integer number (25530369209800).

Almost surely, 2^{102121001110021} is an apocalyptic number.

It is an amenable number.

102121001110021 is a deficient number, since it is larger than the sum of its proper divisors (475729179).

102121001110021 is an equidigital number, since it uses as much as digits as its factorization.

102121001110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475729178.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 102121001110021 its reverse (120011100121201), we get a palindrome (222132101231222).

The spelling of 102121001110021 in words is "one hundred two trillion, one hundred twenty-one billion, one million, one hundred ten thousand, twenty-one".