2161421742 has 64 divisors (see below), whose sum is σ = 4553515008. Its totient is φ = 683100000.

The previous prime is 2161421729. The next prime is 2161421761. The reversal of 2161421742 is 2471241612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3127617 + ... + 3128307.

It is an arithmetic number, because the mean of its divisors is an integer number (71148672).

Almost surely, 2^2161421742 is an apocalyptic number.

2161421742 is an abundant number, since it is smaller than the sum of its proper divisors (2392093266).

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

2161421742 is a wasteful number, since it uses less digits than its factorization.

2161421742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045.

The product of its digits is 5376, while the sum is 30.

The square root of 2161421742 is about 46491.0931469674. The cubic root of 2161421742 is about 1292.9443675824.

The spelling of 2161421742 in words is "two billion, one hundred sixty-one million, four hundred twenty-one thousand, seven hundred forty-two".