1221021124 has 24 divisors (see below), whose sum is σ = 2263970520. Its totient is φ = 574219776.

The previous prime is 1221021119. The next prime is 1221021173. The reversal of 1221021124 is 4211201221.

It can be written as a sum of positive squares in 4 ways, for example, as 543356100 + 677665024 = 23310^2 + 26032^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221021098 and 1221021107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116634 + ... + 126670.

It is an arithmetic number, because the mean of its divisors is an integer number (94332105).

Almost surely, 2^1221021124 is an apocalyptic number.

It is an amenable number.

1221021124 is a deficient number, since it is larger than the sum of its proper divisors (1042949396).

1221021124 is a wasteful number, since it uses less digits than its factorization.

1221021124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11847 (or 11845 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1221021124 is about 34943.1126833315. The cubic root of 1221021124 is about 1068.8277621383.

Adding to 1221021124 its reverse (4211201221), we get a palindrome (5432222345).

The spelling of 1221021124 in words is "one billion, two hundred twenty-one million, twenty-one thousand, one hundred twenty-four".