20121231022 has 4 divisors (see below), whose sum is σ = 30181846536. Its totient is φ = 10060615510.

The previous prime is 20121230981. The next prime is 20121231023. The reversal of 20121231022 is 22013212102.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 20121230987 and 20121231005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121231023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5030307754 + ... + 5030307757.

It is an arithmetic number, because the mean of its divisors is an integer number (7545461634).

Almost surely, 2^20121231022 is an apocalyptic number.

20121231022 is a deficient number, since it is larger than the sum of its proper divisors (10060615514).

20121231022 is a wasteful number, since it uses less digits than its factorization.

20121231022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10060615513.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20121231022 its reverse (22013212102), we get a palindrome (42134443124).

The spelling of 20121231022 in words is "twenty billion, one hundred twenty-one million, two hundred thirty-one thousand, twenty-two".