2157152381 has 8 divisors (see below), whose sum is σ = 2188440384. Its totient is φ = 2126063520.

The previous prime is 2157152341. The next prime is 2157152383. The reversal of 2157152381 is 1832517512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2157152381 - 2¹⁸ = 2156890237 is a prime.

It is a super-2 number, since 2×2157152381² = 9306612789707938322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157152383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27896 + ... + 71361.

It is an arithmetic number, because the mean of its divisors is an integer number (273555048).

Almost surely, 2^2157152381 is an apocalyptic number.

It is an amenable number.

2157152381 is a deficient number, since it is larger than the sum of its proper divisors (31288003).

2157152381 is a wasteful number, since it uses less digits than its factorization.

2157152381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99571.

The product of its digits is 16800, while the sum is 35.

The square root of 2157152381 is about 46445.1545481334. The cubic root of 2157152381 is about 1292.0925078018.

Adding to 2157152381 its reverse (1832517512), we get a palindrome (3989669893).

The spelling of 2157152381 in words is "two billion, one hundred fifty-seven million, one hundred fifty-two thousand, three hundred eighty-one".