121402021423 has 4 divisors (see below), whose sum is σ = 123213991960. Its totient is φ = 119590050888.

The previous prime is 121402021337. The next prime is 121402021441. The reversal of 121402021423 is 324120204121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121402021423 - 2⁹ = 121402020911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121402021394 and 121402021403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121402021493) 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, 905985168 + ... + 905985301.

It is an arithmetic number, because the mean of its divisors is an integer number (30803497990).

Almost surely, 2^121402021423 is an apocalyptic number.

121402021423 is a deficient number, since it is larger than the sum of its proper divisors (1811970537).

121402021423 is an equidigital number, since it uses as much as digits as its factorization.

121402021423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1811970536.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 121402021423 its reverse (324120204121), we get a palindrome (445522225544).

The spelling of 121402021423 in words is "one hundred twenty-one billion, four hundred two million, twenty-one thousand, four hundred twenty-three".