1221052464 has 30 divisors (see below), whose sum is σ = 3417251396. Its totient is φ = 407017440.

The previous prime is 1221052463. The next prime is 1221052493. The reversal of 1221052464 is 4642501221.

1221052464 is a `hidden beast` number, since 122 + 10 + 524 + 6 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (1221052463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4239622 + ... + 4239909.

Almost surely, 2^1221052464 is an apocalyptic number.

It is an amenable number.

1221052464 is an abundant number, since it is smaller than the sum of its proper divisors (2196198932).

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

1221052464 is a wasteful number, since it uses less digits than its factorization.

1221052464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8479545 (or 8479536 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1221052464 is about 34943.5611236176. The cubic root of 1221052464 is about 1068.8369066089.

Adding to 1221052464 its reverse (4642501221), we get a palindrome (5863553685).

The spelling of 1221052464 in words is "one billion, two hundred twenty-one million, fifty-two thousand, four hundred sixty-four".