20121131000 has 64 divisors (see below), whose sum is σ = 47107176480. Its totient is φ = 8044396800.

The previous prime is 20121130999. The next prime is 20121131053. The reversal of 20121131000 is 13112102.

It is a super-2 number, since 2×20121131000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2703284 + ... + 2710716.

Almost surely, 2^20121131000 is an apocalyptic number.

20121131000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121131000 is an abundant number, since it is smaller than the sum of its proper divisors (26986045480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121131000 is a wasteful number, since it uses less digits than its factorization.

20121131000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161 (or 10147 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20121131000 its reverse (13112102), we get a palindrome (20134243102).

The spelling of 20121131000 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-one thousand".