1212021516 has 12 divisors (see below), whose sum is σ = 2828050232. Its totient is φ = 404007168.

The previous prime is 1212021479. The next prime is 1212021523. The reversal of 1212021516 is 6151202121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1212021492 and 1212021501.

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, 50500885 + ... + 50500908.

Almost surely, 2^1212021516 is an apocalyptic number.

It is an amenable number.

1212021516 is an abundant number, since it is smaller than the sum of its proper divisors (1616028716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212021516 is a wasteful number, since it uses less digits than its factorization.

1212021516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101001800 (or 101001798 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 1212021516 is about 34814.0993851629. The cubic root of 1212021516 is about 1066.1953313853.

Adding to 1212021516 its reverse (6151202121), we get a palindrome (7363223637).

The spelling of 1212021516 in words is "one billion, two hundred twelve million, twenty-one thousand, five hundred sixteen".