151022221 has 8 divisors (see below), whose sum is σ = 175173440. Its totient is φ = 127515168.

The previous prime is 151022219. The next prime is 151022243. The reversal of 151022221 is 122220151.

It is a happy number.

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 151022221 - 2¹ = 151022219 is a prime.

It is a super-3 number, since 3×151022221³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 151022195 and 151022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151022821) 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, 160536 + ... + 161473.

It is an arithmetic number, because the mean of its divisors is an integer number (21896680).

Almost surely, 2^151022221 is an apocalyptic number.

It is an amenable number.

151022221 is a deficient number, since it is larger than the sum of its proper divisors (24151219).

151022221 is an equidigital number, since it uses as much as digits as its factorization.

151022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322083.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 151022221 is about 12289.1098538503. The cubic root of 151022221 is about 532.5335219553.

Adding to 151022221 its reverse (122220151), we get a palindrome (273242372).

The spelling of 151022221 in words is "one hundred fifty-one million, twenty-two thousand, two hundred twenty-one".