2102151025440 has 72 divisors (see below), whose sum is σ = 7173590379228. Its totient is φ = 560573606400.

The previous prime is 2102151025421. The next prime is 2102151025451. The reversal of 2102151025440 is 445201512012.

It is a happy number.

2102151025440 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 15 + 102 + 544 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2081106300816 + 21044724624 = 1442604^2 + 145068^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 729912111 + ... + 729914990.

Almost surely, 2^{2102151025440} is an apocalyptic number.

2102151025440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2102151025440 is an abundant number, since it is smaller than the sum of its proper divisors (5071439353788).

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

2102151025440 is a wasteful number, since it uses less digits than its factorization.

2102151025440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459827122 (or 1459827111 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 2102151025440 its reverse (445201512012), we get a palindrome (2547352537452).

The spelling of 2102151025440 in words is "two trillion, one hundred two billion, one hundred fifty-one million, twenty-five thousand, four hundred forty".