1211222021 has 8 divisors (see below), whose sum is σ = 1265232960. Its totient is φ = 1157323552.

The previous prime is 1211222017. The next prime is 1211222029. The reversal of 1211222021 is 1202221121.

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 1211222021 - 2² = 1211222017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211221987 and 1211222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211222029) 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, 5711 + ... + 49548.

It is an arithmetic number, because the mean of its divisors is an integer number (158154120).

Almost surely, 2^1211222021 is an apocalyptic number.

It is an amenable number.

1211222021 is a deficient number, since it is larger than the sum of its proper divisors (54010939).

1211222021 is an equidigital number, since it uses as much as digits as its factorization.

1211222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56235.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1211222021 is about 34802.6151459915. The cubic root of 1211222021 is about 1065.9608456321.

Adding to 1211222021 its reverse (1202221121), we get a palindrome (2413443142).

The spelling of 1211222021 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, twenty-one".