222121537 has 8 divisors (see below), whose sum is σ = 242897760. Its totient is φ = 201442560.

The previous prime is 222121517. The next prime is 222121547. The reversal of 222121537 is 735121222.

222121537 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-222121537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222121517) 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, 19488 + ... + 28705.

It is an arithmetic number, because the mean of its divisors is an integer number (30362220).

Almost surely, 2^222121537 is an apocalyptic number.

It is an amenable number.

222121537 is a deficient number, since it is larger than the sum of its proper divisors (20776223).

222121537 is a wasteful number, since it uses less digits than its factorization.

222121537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48623.

The product of its digits is 1680, while the sum is 25.

The square root of 222121537 is about 14903.7423823683. The cubic root of 222121537 is about 605.6153718627.

Adding to 222121537 its reverse (735121222), we get a palindrome (957242759).

The spelling of 222121537 in words is "two hundred twenty-two million, one hundred twenty-one thousand, five hundred thirty-seven".