1221132021 has 8 divisors (see below), whose sum is σ = 1634989440. Its totient is φ = 810681312.

The previous prime is 1221132019. The next prime is 1221132041. The reversal of 1221132021 is 1202311221.

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

It is not a de Polignac number, because 1221132021 - 2¹ = 1221132019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221132041) 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, 850840 + ... + 852273.

It is an arithmetic number, because the mean of its divisors is an integer number (204373680).

Almost surely, 2^1221132021 is an apocalyptic number.

It is an amenable number.

1221132021 is a deficient number, since it is larger than the sum of its proper divisors (413857419).

1221132021 is a wasteful number, since it uses less digits than its factorization.

1221132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703355.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1221132021 is about 34944.6994693044. The cubic root of 1221132021 is about 1068.8601192645.

Adding to 1221132021 its reverse (1202311221), we get a palindrome (2423443242).

The spelling of 1221132021 in words is "one billion, two hundred twenty-one million, one hundred thirty-two thousand, twenty-one".