21310221151 has 16 divisors (see below), whose sum is σ = 22272544800. Its totient is φ = 20368723968.

The previous prime is 21310221113. The next prime is 21310221161. The reversal of 21310221151 is 15112201312.

It is a cyclic number.

It is not a de Polignac number, because 21310221151 - 2¹¹ = 21310219103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21310221161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4557951 + ... + 4562623.

It is an arithmetic number, because the mean of its divisors is an integer number (1392034050).

Almost surely, 2^21310221151 is an apocalyptic number.

21310221151 is a deficient number, since it is larger than the sum of its proper divisors (962323649).

21310221151 is a wasteful number, since it uses less digits than its factorization.

21310221151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6858.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21310221151 its reverse (15112201312), we get a palindrome (36422422463).

The spelling of 21310221151 in words is "twenty-one billion, three hundred ten million, two hundred twenty-one thousand, one hundred fifty-one".