2142671521 has 9 divisors (see below), whose sum is σ = 2198153433. Its totient is φ = 2088559680.

The previous prime is 2142671507. The next prime is 2142671539. The reversal of 2142671521 is 1251762412.

The square root of 2142671521 is 46289.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1619177121 + 523494400 = 40239^2 + 22880^2 .

It is not a de Polignac number, because 2142671521 - 2¹³ = 2142663329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2142671581) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1897285 + ... + 1898413.

Almost surely, 2^2142671521 is an apocalyptic number.

2142671521 is the 46289-th square number.

2142671521 is the 23145-th centered octagonal number.

It is an amenable number.

2142671521 is a deficient number, since it is larger than the sum of its proper divisors (55481912).

2142671521 is an frugal number, since it uses more digits than its factorization.

2142671521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340 (or 1170 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The cubic root of 2142671521 is about 1289.1947623710.

The spelling of 2142671521 in words is "two billion, one hundred forty-two million, six hundred seventy-one thousand, five hundred twenty-one".