11651221930 has 32 divisors (see below), whose sum is σ = 21761134416. Its totient is φ = 4487768064.

The previous prime is 11651221927. The next prime is 11651221931. The reversal of 11651221930 is 3912215611.

It can be written as a sum of positive squares in 8 ways, for example, as 7314867729 + 4336354201 = 85527^2 + 65851^2 .

It is a super-2 number, since 2×11651221930² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11651221892 and 11651221901.

It is not an unprimeable number, because it can be changed into a prime (11651221931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126429 + ... + 198208.

Almost surely, 2^11651221930 is an apocalyptic number.

11651221930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11651221930 is a deficient number, since it is larger than the sum of its proper divisors (10109912486).

11651221930 is a wasteful number, since it uses less digits than its factorization.

11651221930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324778.

The product of its (nonzero) digits is 3240, while the sum is 31.

The spelling of 11651221930 in words is "eleven billion, six hundred fifty-one million, two hundred twenty-one thousand, nine hundred thirty".