20121201400 has 72 divisors (see below), whose sum is σ = 49373759520. Its totient is φ = 7624848960.

The previous prime is 20121201323. The next prime is 20121201407. The reversal of 20121201400 is 410212102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121201407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 67144 + ... + 211543.

It is an arithmetic number, because the mean of its divisors is an integer number (685746660).

Almost surely, 2^20121201400 is an apocalyptic number.

20121201400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121201400 is an abundant number, since it is smaller than the sum of its proper divisors (29252558120).

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

20121201400 is a wasteful number, since it uses less digits than its factorization.

20121201400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278741 (or 278713 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20121201400 its reverse (410212102), we get a palindrome (20531413502).

The spelling of 20121201400 in words is "twenty billion, one hundred twenty-one million, two hundred one thousand, four hundred".