21122120147 has 8 divisors (see below), whose sum is σ = 21147478800. Its totient is φ = 21096779904.

The previous prime is 21122120143. The next prime is 21122120179. The reversal of 21122120147 is 74102122112.

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

It is a cyclic number.

It is not a de Polignac number, because 21122120147 - 2² = 21122120143 is a prime.

It is a super-2 number, since 2×21122120147² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122120143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4275863 + ... + 4280799.

It is an arithmetic number, because the mean of its divisors is an integer number (2643434850).

Almost surely, 2^21122120147 is an apocalyptic number.

21122120147 is a deficient number, since it is larger than the sum of its proper divisors (25358653).

21122120147 is a wasteful number, since it uses less digits than its factorization.

21122120147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9205.

The product of its (nonzero) digits is 448, while the sum is 23.

Adding to 21122120147 its reverse (74102122112), we get a palindrome (95224242259).

The spelling of 21122120147 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, one hundred forty-seven".