121323640 has 32 divisors (see below), whose sum is σ = 279330480. Its totient is φ = 47400192.

The previous prime is 121323613. The next prime is 121323641. The reversal of 121323640 is 46323121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121323641) 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, 33549 + ... + 36988.

Almost surely, 2^121323640 is an apocalyptic number.

121323640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121323640 is an abundant number, since it is smaller than the sum of its proper divisors (158006840).

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

121323640 is a wasteful number, since it uses less digits than its factorization.

121323640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70591 (or 70587 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 121323640 is about 11014.7010853677. The cubic root of 121323640 is about 495.0493301856.

Adding to 121323640 its reverse (46323121), we get a palindrome (167646761).

It can be divided in two parts, 121 and 323640, that added together give a square (323761 = 569²).

The spelling of 121323640 in words is "one hundred twenty-one million, three hundred twenty-three thousand, six hundred forty".