2154421542 has 128 divisors (see below), whose sum is σ = 5543516160. Its totient is φ = 542868480.

The previous prime is 2154421541. The next prime is 2154421553. The reversal of 2154421542 is 2451244512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154421541) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1630242 + ... + 1631562.

It is an arithmetic number, because the mean of its divisors is an integer number (43308720).

Almost surely, 2^2154421542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2154421542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2771758080).

2154421542 is an abundant number, since it is smaller than the sum of its proper divisors (3389094618).

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

2154421542 is a wasteful number, since it uses less digits than its factorization.

2154421542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478.

The product of its digits is 12800, while the sum is 30.

The square root of 2154421542 is about 46415.7467030317. The cubic root of 2154421542 is about 1291.5470376635.

The spelling of 2154421542 in words is "two billion, one hundred fifty-four million, four hundred twenty-one thousand, five hundred forty-two".