1221564530 has 32 divisors (see below), whose sum is σ = 2317498560. Its totient is φ = 462317760.

The previous prime is 1221564503. The next prime is 1221564607. The reversal of 1221564530 is 354651221.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221564493 and 1221564502.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162965 + ... + 170295.

It is an arithmetic number, because the mean of its divisors is an integer number (72421830).

Almost surely, 2^1221564530 is an apocalyptic number.

1221564530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221564530 is a deficient number, since it is larger than the sum of its proper divisors (1095934030).

1221564530 is a wasteful number, since it uses less digits than its factorization.

1221564530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8234.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1221564530 is about 34950.8873993208. The cubic root of 1221564530 is about 1068.9862964632.

The spelling of 1221564530 in words is "one billion, two hundred twenty-one million, five hundred sixty-four thousand, five hundred thirty".