1205221501 has 16 divisors (see below), whose sum is σ = 1357329600. Its totient is φ = 1060657920.

The previous prime is 1205221487. The next prime is 1205221529. The reversal of 1205221501 is 1051225021.

It is a cyclic number.

It is not a de Polignac number, because 1205221501 - 2⁷ = 1205221373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205221531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42175 + ... + 64723.

It is an arithmetic number, because the mean of its divisors is an integer number (84833100).

Almost surely, 2^1205221501 is an apocalyptic number.

1205221501 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1205221501 is a deficient number, since it is larger than the sum of its proper divisors (152108099).

1205221501 is a wasteful number, since it uses less digits than its factorization.

1205221501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22716.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 1205221501 is about 34716.3002205016. The cubic root of 1205221501 is about 1064.1976370412.

Adding to 1205221501 its reverse (1051225021), we get a palindrome (2256446522).

The spelling of 1205221501 in words is "one billion, two hundred five million, two hundred twenty-one thousand, five hundred one".