1211222445 has 16 divisors (see below), whose sum is σ = 1944577152. Its totient is φ = 643778240.

The previous prime is 1211222429. The next prime is 1211222461. The reversal of 1211222445 is 5442221121.

It is an interprime number because it is at equal distance from previous prime (1211222429) and next prime (1211222461).

It is not a de Polignac number, because 1211222445 - 2⁴ = 1211222429 is a prime.

It is a super-2 number, since 2×1211222445² = 2934119622543556050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133401 + ... + 142190.

It is an arithmetic number, because the mean of its divisors is an integer number (121536072).

Almost surely, 2^1211222445 is an apocalyptic number.

1211222445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1211222445 is a deficient number, since it is larger than the sum of its proper divisors (733354707).

1211222445 is a wasteful number, since it uses less digits than its factorization.

1211222445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275892.

The product of its digits is 1280, while the sum is 24.

The square root of 1211222445 is about 34802.6212374873. The cubic root of 1211222445 is about 1065.9609700154.

Adding to 1211222445 its reverse (5442221121), we get a palindrome (6653443566).

The spelling of 1211222445 in words is "one billion, two hundred eleven million, two hundred twenty-two thousand, four hundred forty-five".