1221253036 has 24 divisors (see below), whose sum is σ = 2199637440. Its totient is φ = 593035152.

The previous prime is 1221253031. The next prime is 1221253051. The reversal of 1221253036 is 6303521221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221253036.

It is not an unprimeable number, because it can be changed into a prime (1221253031) 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, 11586 + ... + 50761.

It is an arithmetic number, because the mean of its divisors is an integer number (91651560).

Almost surely, 2^1221253036 is an apocalyptic number.

It is an amenable number.

1221253036 is a deficient number, since it is larger than the sum of its proper divisors (978384404).

1221253036 is a wasteful number, since it uses less digits than its factorization.

1221253036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62493 (or 62491 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1221253036 is about 34946.4309479523. The cubic root of 1221253036 is about 1068.8954263491.

Adding to 1221253036 its reverse (6303521221), we get a palindrome (7524774257).

The spelling of 1221253036 in words is "one billion, two hundred twenty-one million, two hundred fifty-three thousand, thirty-six".