2102515378 has 4 divisors (see below), whose sum is σ = 3153773070. Its totient is φ = 1051257688.

The previous prime is 2102515369. The next prime is 2102515379. The reversal of 2102515378 is 8735152012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2092422049 + 10093329 = 45743^2 + 3177^2 .

It is not an unprimeable number, because it can be changed into a prime (2102515379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525628843 + ... + 525628846.

Almost surely, 2^2102515378 is an apocalyptic number.

2102515378 is a deficient number, since it is larger than the sum of its proper divisors (1051257692).

2102515378 is a wasteful number, since it uses less digits than its factorization.

2102515378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051257691.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 2102515378 is about 45853.1937600861. The cubic root of 2102515378 is about 1281.0902531495.

The spelling of 2102515378 in words is "two billion, one hundred two million, five hundred fifteen thousand, three hundred seventy-eight".