2151212164154 has 4 divisors (see below), whose sum is σ = 3226818246234. Its totient is φ = 1075606082076.

The previous prime is 2151212164069. The next prime is 2151212164181. The reversal of 2151212164154 is 4514612121512.

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., 2147757663529 + 3454500625 = 1465523^2 + 58775^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537803041037 + ... + 537803041040.

Almost surely, 2^{2151212164154} is an apocalyptic number.

2151212164154 is a deficient number, since it is larger than the sum of its proper divisors (1075606082080).

2151212164154 is a wasteful number, since it uses less digits than its factorization.

2151212164154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075606082079.

The product of its digits is 19200, while the sum is 35.

Adding to 2151212164154 its reverse (4514612121512), we get a palindrome (6665824285666).

The spelling of 2151212164154 in words is "two trillion, one hundred fifty-one billion, two hundred twelve million, one hundred sixty-four thousand, one hundred fifty-four".