121955420 has 24 divisors (see below), whose sum is σ = 257062848. Its totient is φ = 48600000.

The previous prime is 121955389. The next prime is 121955423. The reversal of 121955420 is 24559121.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121955423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5831 + ... + 16670.

It is an arithmetic number, because the mean of its divisors is an integer number (10710952).

Almost surely, 2^121955420 is an apocalyptic number.

121955420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121955420 is an abundant number, since it is smaller than the sum of its proper divisors (135107428).

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

121955420 is a wasteful number, since it uses less digits than its factorization.

121955420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22781 (or 22779 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 121955420 is about 11043.3427910212. The cubic root of 121955420 is about 495.9071485488.

It can be divided in two parts, 12195 and 5420, that multiplied together give a square (66096900 = 8130²).

The spelling of 121955420 in words is "one hundred twenty-one million, nine hundred fifty-five thousand, four hundred twenty".