21031031149 has 2 divisors, whose sum is σ = 21031031150. Its totient is φ = 21031031148.

The previous prime is 21031031123. The next prime is 21031031227. The reversal of 21031031149 is 94113013012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16911702025 + 4119329124 = 130045^2 + 64182^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031031149 - 2⁵ = 21031031117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21031031849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515515574 + 10515515575.

It is an arithmetic number, because the mean of its divisors is an integer number (10515515575).

Almost surely, 2^21031031149 is an apocalyptic number.

It is an amenable number.

21031031149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031031149 is an equidigital number, since it uses as much as digits as its factorization.

21031031149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21031031149 in words is "twenty-one billion, thirty-one million, thirty-one thousand, one hundred forty-nine".