20312121222231 has 4 divisors (see below), whose sum is σ = 27082828296312. Its totient is φ = 13541414148152.

The previous prime is 20312121222221. The next prime is 20312121222241. The reversal of 20312121222231 is 13222212121302.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20312121222221) and next prime (20312121222241).

It is a cyclic number.

It is not a de Polignac number, because 20312121222231 - 2¹³ = 20312121214039 is a prime.

It is a super-2 number, since 2×20312121222231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20312121222221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3385353537036 + ... + 3385353537041.

It is an arithmetic number, because the mean of its divisors is an integer number (6770707074078).

Almost surely, 2^{20312121222231} is an apocalyptic number.

20312121222231 is a deficient number, since it is larger than the sum of its proper divisors (6770707074081).

20312121222231 is an equidigital number, since it uses as much as digits as its factorization.

20312121222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770707074080.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 20312121222231 its reverse (13222212121302), we get a palindrome (33534333343533).

The spelling of 20312121222231 in words is "twenty trillion, three hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-one".