2150821784 has 8 divisors (see below), whose sum is σ = 4032790860. Its totient is φ = 1075410888.

The previous prime is 2150821763. The next prime is 2150821787. The reversal of 2150821784 is 4871280512.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2150821787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134426354 + ... + 134426369.

Almost surely, 2^2150821784 is an apocalyptic number.

It is an amenable number.

2150821784 is a deficient number, since it is larger than the sum of its proper divisors (1881969076).

2150821784 is a wasteful number, since it uses less digits than its factorization.

2150821784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268852729 (or 268852725 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 2150821784 is about 46376.9531556354. The cubic root of 2150821784 is about 1290.8273009838.

The spelling of 2150821784 in words is "two billion, one hundred fifty million, eight hundred twenty-one thousand, seven hundred eighty-four".