2129502118878 has 96 divisors (see below), whose sum is σ = 4793903861760. Its totient is φ = 682451231040.

The previous prime is 2129502118841. The next prime is 2129502118903. The reversal of 2129502118878 is 8788112059212.

It is a happy number.

2129502118878 is a `hidden beast` number, since 2 + 12 + 9 + 502 + 118 + 8 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111558651 + ... + 111577737.

It is an arithmetic number, because the mean of its divisors is an integer number (49936498560).

Almost surely, 2^{2129502118878} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2129502118878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2396951930880).

2129502118878 is an abundant number, since it is smaller than the sum of its proper divisors (2664401742882).

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

2129502118878 is a wasteful number, since it uses less digits than its factorization.

2129502118878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20422 (or 20419 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 54.

The spelling of 2129502118878 in words is "two trillion, one hundred twenty-nine billion, five hundred two million, one hundred eighteen thousand, eight hundred seventy-eight".