2142155420 has 12 divisors (see below), whose sum is σ = 4498526424. Its totient is φ = 856862160.

The previous prime is 2142155377. The next prime is 2142155429. The reversal of 2142155420 is 245512412.

It is a self number, because there is not a number n which added to its sum of digits gives 2142155420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142155429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53553866 + ... + 53553905.

It is an arithmetic number, because the mean of its divisors is an integer number (374877202).

Almost surely, 2^2142155420 is an apocalyptic number.

2142155420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2142155420 is an abundant number, since it is smaller than the sum of its proper divisors (2356371004).

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

2142155420 is a wasteful number, since it uses less digits than its factorization.

2142155420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107107780 (or 107107778 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2142155420 is about 46283.4248948800. The cubic root of 2142155420 is about 1289.0912454720.

Adding to 2142155420 its reverse (245512412), we get a palindrome (2387667832).

The spelling of 2142155420 in words is "two billion, one hundred forty-two million, one hundred fifty-five thousand, four hundred twenty".