21310221147 has 4 divisors (see below), whose sum is σ = 28413628200. Its totient is φ = 14206814096.

The previous prime is 21310221113. The next prime is 21310221161. The reversal of 21310221147 is 74112201312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21310221147 - 2¹⁵ = 21310188379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21310221187) 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, 3551703522 + ... + 3551703527.

It is an arithmetic number, because the mean of its divisors is an integer number (7103407050).

Almost surely, 2^21310221147 is an apocalyptic number.

21310221147 is a deficient number, since it is larger than the sum of its proper divisors (7103407053).

21310221147 is an equidigital number, since it uses as much as digits as its factorization.

21310221147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7103407052.

The product of its (nonzero) digits is 672, while the sum is 24.

Adding to 21310221147 its reverse (74112201312), we get a palindrome (95422422459).

The spelling of 21310221147 in words is "twenty-one billion, three hundred ten million, two hundred twenty-one thousand, one hundred forty-seven".