20111221031 has 8 divisors (see below), whose sum is σ = 21970819728. Its totient is φ = 18256840000.

The previous prime is 20111221021. The next prime is 20111221057. The reversal of 20111221031 is 13012211102.

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 20111221031 - 2¹⁰ = 20111220007 is a prime.

It is a super-2 number, since 2×20111221031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111220997 and 20111221015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111221021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1296350 + ... + 1311771.

It is an arithmetic number, because the mean of its divisors is an integer number (2746352466).

Almost surely, 2^20111221031 is an apocalyptic number.

20111221031 is a deficient number, since it is larger than the sum of its proper divisors (1859598697).

20111221031 is a wasteful number, since it uses less digits than its factorization.

20111221031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608833.

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

Adding to 20111221031 its reverse (13012211102), we get a palindrome (33123432133).

It can be divided in two parts, 20111 and 221031, that added together give a palindrome (241142).

The spelling of 20111221031 in words is "twenty billion, one hundred eleven million, two hundred twenty-one thousand, thirty-one".