2154222352542 has 256 divisors, whose sum is σ = 5142965990400. Its totient is φ = 595494789120.

The previous prime is 2154222352519. The next prime is 2154222352649. The reversal of 2154222352542 is 2452532224512.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 2154222352542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1212279558 + ... + 1212281334.

It is an arithmetic number, because the mean of its divisors is an integer number (20089710900).

Almost surely, 2^{2154222352542} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154222352542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2571482995200).

2154222352542 is an abundant number, since it is smaller than the sum of its proper divisors (2988743637858).

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

2154222352542 is a wasteful number, since it uses less digits than its factorization.

2154222352542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331.

The product of its digits is 384000, while the sum is 39.

The spelling of 2154222352542 in words is "two trillion, one hundred fifty-four billion, two hundred twenty-two million, three hundred fifty-two thousand, five hundred forty-two".