1401605221 has 4 divisors (see below), whose sum is σ = 1401753600. Its totient is φ = 1401456844.

The previous prime is 1401605207. The next prime is 1401605321. The reversal of 1401605221 is 1225061041.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1225061041 = 131 ⋅9351611.

It is a cyclic number.

It is not a de Polignac number, because 1401605221 - 2⁹ = 1401604709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1401605192 and 1401605201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1401605321) 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, 58981 + ... + 79258.

It is an arithmetic number, because the mean of its divisors is an integer number (350438400).

Almost surely, 2^1401605221 is an apocalyptic number.

It is an amenable number.

1401605221 is a deficient number, since it is larger than the sum of its proper divisors (148379).

1401605221 is a wasteful number, since it uses less digits than its factorization.

1401605221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148378.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1401605221 is about 37438.0183904010. The cubic root of 1401605221 is about 1119.1163366277.

Adding to 1401605221 its reverse (1225061041), we get a palindrome (2626666262).

The spelling of 1401605221 in words is "one billion, four hundred one million, six hundred five thousand, two hundred twenty-one".