20111221999930 has 8 divisors (see below), whose sum is σ = 36200199599892. Its totient is φ = 8044488799968.

The previous prime is 20111221999907. The next prime is 20111221999931. The reversal of 20111221999930 is 3999912211102.

It can be written as a sum of positive squares in 2 ways, for example, as 18913687926169 + 1197534073761 = 4348987^2 + 1094319^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×20111221999930² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20111221999931) 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 3 ways as a sum of consecutive naturals, for example, 1005561099987 + ... + 1005561100006.

Almost surely, 2^{20111221999930} is an apocalyptic number.

20111221999930 is a deficient number, since it is larger than the sum of its proper divisors (16088977599962).

20111221999930 is a wasteful number, since it uses less digits than its factorization.

20111221999930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011122200000.

The product of its (nonzero) digits is 157464, while the sum is 49.

The spelling of 20111221999930 in words is "twenty trillion, one hundred eleven billion, two hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred thirty".