2149215881 has 2 divisors, whose sum is σ = 2149215882. Its totient is φ = 2149215880.

The previous prime is 2149215869. The next prime is 2149215911. The reversal of 2149215881 is 1885129412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1999520656 + 149695225 = 44716^2 + 12235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149215881 - 2²² = 2145021577 is a prime.

It is a super-2 number, since 2×2149215881² = 9238257806285212322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2149215181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074607940 + 1074607941.

It is an arithmetic number, because the mean of its divisors is an integer number (1074607941).

Almost surely, 2^2149215881 is an apocalyptic number.

It is an amenable number.

2149215881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149215881 is an equidigital number, since it uses as much as digits as its factorization.

2149215881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46080, while the sum is 41.

The square root of 2149215881 is about 46359.6363337764. The cubic root of 2149215881 is about 1290.5059572099.

It can be divided in two parts, 21492 and 15881, that added together give a palindrome (37373).

The spelling of 2149215881 in words is "two billion, one hundred forty-nine million, two hundred fifteen thousand, eight hundred eighty-one".