121421423420 has 48 divisors (see below), whose sum is σ = 278292254688. Its totient is φ = 44133116160.

The previous prime is 121421423369. The next prime is 121421423467. The reversal of 121421423420 is 24324124121.

It is a self number, because there is not a number n which added to its sum of digits gives 121421423420.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 362162 + ... + 611558.

It is an arithmetic number, because the mean of its divisors is an integer number (5797755306).

Almost surely, 2^121421423420 is an apocalyptic number.

121421423420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121421423420 is an abundant number, since it is smaller than the sum of its proper divisors (156870831268).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121421423420 is a wasteful number, since it uses less digits than its factorization.

121421423420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251630 (or 251628 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 121421423420 its reverse (24324124121), we get a palindrome (145745547541).

The spelling of 121421423420 in words is "one hundred twenty-one billion, four hundred twenty-one million, four hundred twenty-three thousand, four hundred twenty".