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242211221 = 7191821137
BaseRepresentation
bin11100110111111…
…01100110010101
3121212202121022222
432123331212111
5444001224341
640011232125
76000522110
oct1633754625
9555677288
10242211221
111147a396a
1269148645
133b246465
142424d577
15163e644b
hexe6fd995

242211221 has 8 divisors (see below), whose sum is σ = 291382080. Its totient is φ = 196682688.

The previous prime is 242211209. The next prime is 242211241. The reversal of 242211221 is 122112242.

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

It is a cyclic number.

It is not a de Polignac number, because 242211221 - 26 = 242211157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242211241) 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, 910436 + ... + 910701.

It is an arithmetic number, because the mean of its divisors is an integer number (36422760).

Almost surely, 2242211221 is an apocalyptic number.

It is an amenable number.

242211221 is a deficient number, since it is larger than the sum of its proper divisors (49170859).

242211221 is a wasteful number, since it uses less digits than its factorization.

242211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1821163.

The product of its digits is 128, while the sum is 17.

The square root of 242211221 is about 15563.1366054533. The cubic root of 242211221 is about 623.3492189672.

Adding to 242211221 its reverse (122112242), we get a palindrome (364323463).

The spelling of 242211221 in words is "two hundred forty-two million, two hundred eleven thousand, two hundred twenty-one".

Divisors: 1 7 19 133 1821137 12747959 34601603 242211221