21115213054 has 8 divisors (see below), whose sum is σ = 34109190360. Its totient is φ = 9745482936.

The previous prime is 21115213051. The next prime is 21115213061. The reversal of 21115213054 is 45031251112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115213051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406061764 + ... + 406061815.

It is an arithmetic number, because the mean of its divisors is an integer number (4263648795).

Almost surely, 2^21115213054 is an apocalyptic number.

21115213054 is a deficient number, since it is larger than the sum of its proper divisors (12993977306).

21115213054 is a wasteful number, since it uses less digits than its factorization.

21115213054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812123594.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21115213054 its reverse (45031251112), we get a palindrome (66146464166).

The spelling of 21115213054 in words is "twenty-one billion, one hundred fifteen million, two hundred thirteen thousand, fifty-four".