20011121231 has 8 divisors (see below), whose sum is σ = 20052204480. Its totient is φ = 19970063872.

The previous prime is 20011121203. The next prime is 20011121237. The reversal of 20011121231 is 13212111002.

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 20011121231 - 2¹⁴ = 20011104847 is a prime.

It is a super-2 number, since 2×20011121231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011121237) 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, 2414711 + ... + 2422983.

It is an arithmetic number, because the mean of its divisors is an integer number (2506525560).

Almost surely, 2^20011121231 is an apocalyptic number.

20011121231 is a deficient number, since it is larger than the sum of its proper divisors (41083249).

20011121231 is an equidigital number, since it uses as much as digits as its factorization.

20011121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12945.

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

Adding to 20011121231 its reverse (13212111002), we get a palindrome (33223232233).

The spelling of 20011121231 in words is "twenty billion, eleven million, one hundred twenty-one thousand, two hundred thirty-one".