223121640 has 64 divisors (see below), whose sum is σ = 764991360. Its totient is φ = 50999040.

The previous prime is 223121627. The next prime is 223121641. The reversal of 223121640 is 46121322.

It is a super-3 number, since 3×223121640³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (223121641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131971 + ... + 133650.

It is an arithmetic number, because the mean of its divisors is an integer number (11952990).

Almost surely, 2^223121640 is an apocalyptic number.

223121640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

223121640 is an abundant number, since it is smaller than the sum of its proper divisors (541869720).

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

223121640 is a wasteful number, since it uses less digits than its factorization.

223121640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265642 (or 265638 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 223121640 is about 14937.2567762625. The cubic root of 223121640 is about 606.5229395595.

Adding to 223121640 its reverse (46121322), we get a palindrome (269242962).

It can be divided in two parts, 2231 and 21640, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 223121640 in words is "two hundred twenty-three million, one hundred twenty-one thousand, six hundred forty".