1221150621 has 8 divisors (see below), whose sum is σ = 1628794144. Its totient is φ = 813803760.

The previous prime is 1221150611. The next prime is 1221150629. The reversal of 1221150621 is 1260511221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221150621 - 2¹⁰ = 1221149597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221150629) 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, 64375 + ... + 81156.

It is an arithmetic number, because the mean of its divisors is an integer number (203599268).

Almost surely, 2^1221150621 is an apocalyptic number.

It is an amenable number.

1221150621 is a deficient number, since it is larger than the sum of its proper divisors (407643523).

1221150621 is a wasteful number, since it uses less digits than its factorization.

1221150621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148331.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1221150621 is about 34944.9656030736. The cubic root of 1221150621 is about 1068.8655461135.

Adding to 1221150621 its reverse (1260511221), we get a palindrome (2481661842).

The spelling of 1221150621 in words is "one billion, two hundred twenty-one million, one hundred fifty thousand, six hundred twenty-one".