121705420 has 24 divisors (see below), whose sum is σ = 266694624. Its totient is φ = 46565376.

The previous prime is 121705379. The next prime is 121705421. The reversal of 121705420 is 24507121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121705391 and 121705400.

It is not an unprimeable number, because it can be changed into a prime (121705421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131829 + ... + 132748.

It is an arithmetic number, because the mean of its divisors is an integer number (11112276).

Almost surely, 2^121705420 is an apocalyptic number.

121705420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121705420 is an abundant number, since it is smaller than the sum of its proper divisors (144989204).

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

121705420 is a wasteful number, since it uses less digits than its factorization.

121705420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264609 (or 264607 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 121705420 is about 11032.0179477737. The cubic root of 121705420 is about 495.5680585264.

The spelling of 121705420 in words is "one hundred twenty-one million, seven hundred five thousand, four hundred twenty".