1219661221 has 8 divisors (see below), whose sum is σ = 1240471584. Its totient is φ = 1199025360.

The previous prime is 1219661189. The next prime is 1219661257. The reversal of 1219661221 is 1221669121.

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 1219661221 - 2⁵ = 1219661189 is a prime.

It is a super-2 number, since 2×1219661221² = 2975146988022421682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219661291) 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, 29490 + ... + 57523.

It is an arithmetic number, because the mean of its divisors is an integer number (155058948).

Almost surely, 2^1219661221 is an apocalyptic number.

It is an amenable number.

1219661221 is a deficient number, since it is larger than the sum of its proper divisors (20810363).

1219661221 is a wasteful number, since it uses less digits than its factorization.

1219661221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87251.

The product of its digits is 2592, while the sum is 31.

The square root of 1219661221 is about 34923.6484491526. The cubic root of 1219661221 is about 1068.4308151363.

The spelling of 1219661221 in words is "one billion, two hundred nineteen million, six hundred sixty-one thousand, two hundred twenty-one".