20121011252 has 12 divisors (see below), whose sum is σ = 36070593636. Its totient is φ = 9815127360.

The previous prime is 20121011231. The next prime is 20121011257. The reversal of 20121011252 is 25211012102.

It can be written as a sum of positive squares in 2 ways, for example, as 10217975056 + 9903036196 = 101084^2 + 99514^2 .

It is a super-2 number, since 2×20121011252² (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 20121011252.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121011257) 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, 61344383 + ... + 61344710.

It is an arithmetic number, because the mean of its divisors is an integer number (3005882803).

Almost surely, 2^20121011252 is an apocalyptic number.

It is an amenable number.

20121011252 is a deficient number, since it is larger than the sum of its proper divisors (15949582384).

20121011252 is a wasteful number, since it uses less digits than its factorization.

20121011252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122689138 (or 122689136 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 20121011252 its reverse (25211012102), we get a palindrome (45332023354).

The spelling of 20121011252 in words is "twenty billion, one hundred twenty-one million, eleven thousand, two hundred fifty-two".