21258110151 has 16 divisors (see below), whose sum is σ = 31604792320. Its totient is φ = 14121990360.

The previous prime is 21258110143. The next prime is 21258110171. The reversal of 21258110151 is 15101185212.

21258110151 is a `hidden beast` number, since 21 + 2 + 581 + 10 + 1 + 51 = 666.

It is not a de Polignac number, because 21258110151 - 2³ = 21258110143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21258110141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1383415 + ... + 1398696.

It is an arithmetic number, because the mean of its divisors is an integer number (1975299520).

Almost surely, 2^21258110151 is an apocalyptic number.

21258110151 is a deficient number, since it is larger than the sum of its proper divisors (10346682169).

21258110151 is a wasteful number, since it uses less digits than its factorization.

21258110151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782403 (or 2782397 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 27.

Adding to 21258110151 its reverse (15101185212), we get a palindrome (36359295363).

The spelling of 21258110151 in words is "twenty-one billion, two hundred fifty-eight million, one hundred ten thousand, one hundred fifty-one".