21512154734162 has 4 divisors (see below), whose sum is σ = 32268232101246. Its totient is φ = 10756077367080.

The previous prime is 21512154734143. The next prime is 21512154734233. The reversal of 21512154734162 is 26143745121512.

It is a happy number.

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., 17299435429081 + 4212719305081 = 4159259^2 + 2052491^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5378038683539 + ... + 5378038683542.

Almost surely, 2^{21512154734162} is an apocalyptic number.

21512154734162 is a deficient number, since it is larger than the sum of its proper divisors (10756077367084).

21512154734162 is a wasteful number, since it uses less digits than its factorization.

21512154734162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10756077367083.

The product of its digits is 403200, while the sum is 44.

Adding to 21512154734162 its reverse (26143745121512), we get a palindrome (47655899855674).

The spelling of 21512154734162 in words is "twenty-one trillion, five hundred twelve billion, one hundred fifty-four million, seven hundred thirty-four thousand, one hundred sixty-two".