20121220232 has 8 divisors (see below), whose sum is σ = 37727287950. Its totient is φ = 10060610112.

The previous prime is 20121220187. The next prime is 20121220241. The reversal of 20121220232 is 23202212102.

It can be written as a sum of positive squares in only one way, i.e., 10291290916 + 9829929316 = 101446^2 + 99146^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20121220232² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20121220232.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1257576257 + ... + 1257576272.

Almost surely, 2^20121220232 is an apocalyptic number.

It is an amenable number.

20121220232 is a deficient number, since it is larger than the sum of its proper divisors (17606067718).

20121220232 is a wasteful number, since it uses less digits than its factorization.

20121220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515152535 (or 2515152531 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20121220232 its reverse (23202212102), we get a palindrome (43323432334).

The spelling of 20121220232 in words is "twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred thirty-two".