20111221013 has 8 divisors (see below), whose sum is σ = 21659540448. Its totient is φ = 18563087664.

The previous prime is 20111221003. The next prime is 20111221021. The reversal of 20111221013 is 31012211102.

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

It is a cyclic number.

It is not a de Polignac number, because 20111221013 - 2¹⁸ = 20110958869 is a prime.

It is a super-2 number, since 2×20111221013² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246206 + ... + 317552.

It is an arithmetic number, because the mean of its divisors is an integer number (2707442556).

Almost surely, 2^20111221013 is an apocalyptic number.

It is an amenable number.

20111221013 is a deficient number, since it is larger than the sum of its proper divisors (1548319435).

20111221013 is a wasteful number, since it uses less digits than its factorization.

20111221013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93043.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20111221013 its reverse (31012211102), we get a palindrome (51123432115).

The spelling of 20111221013 in words is "twenty billion, one hundred eleven million, two hundred twenty-one thousand, thirteen".