21112422147 has 20 divisors (see below), whose sum is σ = 33198223080. Its totient is φ = 13334160384.

The previous prime is 21112422143. The next prime is 21112422151. The reversal of 21112422147 is 74122421112.

21112422147 is a `hidden beast` number, since 211 + 12 + 422 + 14 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (21112422143) and next prime (21112422151).

It is not a de Polignac number, because 21112422147 - 2² = 21112422143 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21112422147.

It is not an unprimeable number, because it can be changed into a prime (21112422143) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6857598 + ... + 6860675.

It is an arithmetic number, because the mean of its divisors is an integer number (1659911154).

Almost surely, 2^21112422147 is an apocalyptic number.

21112422147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21112422147 is a deficient number, since it is larger than the sum of its proper divisors (12085800933).

21112422147 is a wasteful number, since it uses less digits than its factorization.

21112422147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13718304 (or 13718295 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

Adding to 21112422147 its reverse (74122421112), we get a palindrome (95234843259).

The spelling of 21112422147 in words is "twenty-one billion, one hundred twelve million, four hundred twenty-two thousand, one hundred forty-seven".