221940707 has 2 divisors, whose sum is σ = 221940708. Its totient is φ = 221940706.

The previous prime is 221940647. The next prime is 221940727. The reversal of 221940707 is 707049122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221940707 - 2¹⁴ = 221924323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221940727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110970353 + 110970354.

It is an arithmetic number, because the mean of its divisors is an integer number (110970354).

Almost surely, 2^221940707 is an apocalyptic number.

221940707 is a deficient number, since it is larger than the sum of its proper divisors (1).

221940707 is an equidigital number, since it uses as much as digits as its factorization.

221940707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 221940707 is about 14897.6745500766. The cubic root of 221940707 is about 605.4509826413.

Adding to 221940707 its reverse (707049122), we get a palindrome (928989829).

The spelling of 221940707 in words is "two hundred twenty-one million, nine hundred forty thousand, seven hundred seven".