1213222021 has 8 divisors (see below), whose sum is σ = 1355796288. Its totient is φ = 1076028000.

The previous prime is 1213222019. The next prime is 1213222027. The reversal of 1213222021 is 1202223121.

It is a happy number.

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 1213222021 - 2¹ = 1213222019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213221986 and 1213222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213222027) 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, 1344585 + ... + 1345486.

It is an arithmetic number, because the mean of its divisors is an integer number (169474536).

Almost surely, 2^1213222021 is an apocalyptic number.

1213222021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1213222021 is a deficient number, since it is larger than the sum of its proper divisors (142574267).

1213222021 is a wasteful number, since it uses less digits than its factorization.

1213222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690123.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1213222021 is about 34831.3367673421. The cubic root of 1213222021 is about 1066.5472367044.

Adding to 1213222021 its reverse (1202223121), we get a palindrome (2415445142).

The spelling of 1213222021 in words is "one billion, two hundred thirteen million, two hundred twenty-two thousand, twenty-one".