1221001319 has 16 divisors (see below), whose sum is σ = 1302801408. Its totient is φ = 1140352512.

The previous prime is 1221001277. The next prime is 1221001337. The reversal of 1221001319 is 9131001221.

It is a cyclic number.

It is not a de Polignac number, because 1221001319 - 2⁸ = 1221001063 is a prime.

It is a super-2 number, since 2×1221001319² = 2981688441999479522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221001319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1803209 + ... + 1803885.

It is an arithmetic number, because the mean of its divisors is an integer number (81425088).

Almost surely, 2^1221001319 is an apocalyptic number.

1221001319 is a deficient number, since it is larger than the sum of its proper divisors (81800089).

1221001319 is a wasteful number, since it uses less digits than its factorization.

1221001319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1221001319 is about 34942.8292930037. The cubic root of 1221001319 is about 1068.8219833007.

The spelling of 1221001319 in words is "one billion, two hundred twenty-one million, one thousand, three hundred nineteen".