2151231042400 has 144 divisors (see below), whose sum is σ = 5743136634480. Its totient is φ = 780351897600.

The previous prime is 2151231042253. The next prime is 2151231042407. The reversal of 2151231042400 is 42401321512.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151231042407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3300352 + ... + 3898048.

It is an arithmetic number, because the mean of its divisors is an integer number (39882893295).

Almost surely, 2^{2151231042400} is an apocalyptic number.

2151231042400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151231042400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2871568317240).

2151231042400 is an abundant number, since it is smaller than the sum of its proper divisors (3591905592080).

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

2151231042400 is a wasteful number, since it uses less digits than its factorization.

2151231042400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598137 (or 598124 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 2151231042400 its reverse (42401321512), we get a palindrome (2193632363912).

The spelling of 2151231042400 in words is "two trillion, one hundred fifty-one billion, two hundred thirty-one million, forty-two thousand, four hundred".