221142470 has 32 divisors (see below), whose sum is σ = 419221440. Its totient is φ = 83825280.

The previous prime is 221142431. The next prime is 221142491. The reversal of 221142470 is 74241122.

221142470 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20660 + ... + 29480.

It is an arithmetic number, because the mean of its divisors is an integer number (13100670).

Almost surely, 2^221142470 is an apocalyptic number.

221142470 is a deficient number, since it is larger than the sum of its proper divisors (198078970).

221142470 is a wasteful number, since it uses less digits than its factorization.

221142470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8960.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 221142470 is about 14870.8597599466. The cubic root of 221142470 is about 604.7242510876.

Adding to 221142470 its reverse (74241122), we get a palindrome (295383592).

The spelling of 221142470 in words is "two hundred twenty-one million, one hundred forty-two thousand, four hundred seventy".