2181902938870 has 16 divisors (see below), whose sum is σ = 4054116428928. Its totient is φ = 844607589120.

The previous prime is 2181902938867. The next prime is 2181902938879. The reversal of 2181902938870 is 788392091812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181902938879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3519197979 + ... + 3519198598.

It is an arithmetic number, because the mean of its divisors is an integer number (253382276808).

Almost surely, 2^{2181902938870} is an apocalyptic number.

2181902938870 is a deficient number, since it is larger than the sum of its proper divisors (1872213490058).

2181902938870 is a wasteful number, since it uses less digits than its factorization.

2181902938870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7038396615.

The product of its (nonzero) digits is 3483648, while the sum is 58.

The spelling of 2181902938870 in words is "two trillion, one hundred eighty-one billion, nine hundred two million, nine hundred thirty-eight thousand, eight hundred seventy".