1401522221 has 4 divisors (see below), whose sum is σ = 1528933344. Its totient is φ = 1274111100.

The previous prime is 1401522217. The next prime is 1401522247. The reversal of 1401522221 is 1222251041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1401522221 - 2² = 1401522217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1401522193 and 1401522202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401522271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63705545 + ... + 63705566.

It is an arithmetic number, because the mean of its divisors is an integer number (382233336).

Almost surely, 2^1401522221 is an apocalyptic number.

1401522221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1401522221 is a deficient number, since it is larger than the sum of its proper divisors (127411123).

1401522221 is a wasteful number, since it uses less digits than its factorization.

1401522221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127411122.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1401522221 is about 37436.9098751486. The cubic root of 1401522221 is about 1119.0942456498.

Adding to 1401522221 its reverse (1222251041), we get a palindrome (2623773262).

The spelling of 1401522221 in words is "one billion, four hundred one million, five hundred twenty-two thousand, two hundred twenty-one".