220137971 has 4 divisors (see below), whose sum is σ = 231724200. Its totient is φ = 208551744.

The previous prime is 220137961. The next prime is 220138001. The reversal of 220137971 is 179731022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220137971 - 2¹⁰ = 220136947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220137961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5793086 + ... + 5793123.

It is an arithmetic number, because the mean of its divisors is an integer number (57931050).

Almost surely, 2^220137971 is an apocalyptic number.

220137971 is a deficient number, since it is larger than the sum of its proper divisors (11586229).

220137971 is a wasteful number, since it uses less digits than its factorization.

220137971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11586228.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 220137971 is about 14837.0472466728. The cubic root of 220137971 is about 603.8072450068.

Adding to 220137971 its reverse (179731022), we get a palindrome (399868993).

The spelling of 220137971 in words is "two hundred twenty million, one hundred thirty-seven thousand, nine hundred seventy-one".