1221512 has 16 divisors (see below), whose sum is σ = 2313360. Its totient is φ = 604624.

The previous prime is 1221503. The next prime is 1221523. The reversal of 1221512 is 2151221.

It is a super-2 number, since 2×1221512² = 2984183132288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143 + ... + 1569.

It is an arithmetic number, because the mean of its divisors is an integer number (144585).

2^1221512 is an apocalyptic number.

It is an amenable number.

1221512 is a deficient number, since it is larger than the sum of its proper divisors (1091848).

1221512 is a wasteful number, since it uses less digits than its factorization.

1221512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 1536 counting only the distinct ones).

The product of its digits is 40, while the sum is 14.

The square root of 1221512 is about 1105.2203400227. The cubic root of 1221512 is about 106.8970973312.

Adding to 1221512 its reverse (2151221), we get a palindrome (3372733).

The spelling of 1221512 in words is "one million, two hundred twenty-one thousand, five hundred twelve".