2121261020144 has 40 divisors (see below), whose sum is σ = 4701789432288. Its totient is φ = 908199970560.

The previous prime is 2121261020143. The next prime is 2121261020159. The reversal of 2121261020144 is 4410201621212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121261020143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9386747 + ... + 9610074.

Almost surely, 2^{2121261020144} is an apocalyptic number.

It is an amenable number.

2121261020144 is an abundant number, since it is smaller than the sum of its proper divisors (2580528412144).

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

2121261020144 is a wasteful number, since it uses less digits than its factorization.

2121261020144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18997833 (or 18997827 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 2121261020144 its reverse (4410201621212), we get a palindrome (6531462641356).

The spelling of 2121261020144 in words is "two trillion, one hundred twenty-one billion, two hundred sixty-one million, twenty thousand, one hundred forty-four".