1550040221 has 8 divisors (see below), whose sum is σ = 1587261984. Its totient is φ = 1512871920.

The previous prime is 1550040203. The next prime is 1550040251. The reversal of 1550040221 is 1220400551.

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 1550040221 - 2³⁰ = 476298397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1550040193 and 1550040202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550040251) 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, 48731 + ... + 73991.

It is an arithmetic number, because the mean of its divisors is an integer number (198407748).

Almost surely, 2^1550040221 is an apocalyptic number.

It is an amenable number.

1550040221 is a deficient number, since it is larger than the sum of its proper divisors (37221763).

1550040221 is a wasteful number, since it uses less digits than its factorization.

1550040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26731.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1550040221 is about 39370.5501739562. The cubic root of 1550040221 is about 1157.3045374007.

Adding to 1550040221 its reverse (1220400551), we get a palindrome (2770440772).

The spelling of 1550040221 in words is "one billion, five hundred fifty million, forty thousand, two hundred twenty-one".