21151213114 has 4 divisors (see below), whose sum is σ = 31726819674. Its totient is φ = 10575606556.

The previous prime is 21151213099. The next prime is 21151213189. The reversal of 21151213114 is 41131215112.

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., 21150757489 + 455625 = 145433^2 + 675^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5287803277 + ... + 5287803280.

Almost surely, 2^21151213114 is an apocalyptic number.

21151213114 is a deficient number, since it is larger than the sum of its proper divisors (10575606560).

21151213114 is a wasteful number, since it uses less digits than its factorization.

21151213114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10575606559.

The product of its digits is 240, while the sum is 22.

Adding to 21151213114 its reverse (41131215112), we get a palindrome (62282428226).

The spelling of 21151213114 in words is "twenty-one billion, one hundred fifty-one million, two hundred thirteen thousand, one hundred fourteen".