2101451521 has 8 divisors (see below), whose sum is σ = 2268924840. Its totient is φ = 1934810112.

The previous prime is 2101451507. The next prime is 2101451579. The reversal of 2101451521 is 1251541012.

It can be written as a sum of positive squares in 4 ways, for example, as 131423296 + 1970028225 = 11464^2 + 44385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2101451521 - 2⁵ = 2101451489 is a prime.

It is a super-2 number, since 2×2101451521² = 8832196990226426882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2101451492 and 2101451501.

It is not an unprimeable number, because it can be changed into a prime (2101457521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202720 + ... + 212833.

It is an arithmetic number, because the mean of its divisors is an integer number (283615605).

Almost surely, 2^2101451521 is an apocalyptic number.

It is an amenable number.

2101451521 is a deficient number, since it is larger than the sum of its proper divisors (167473319).

2101451521 is a wasteful number, since it uses less digits than its factorization.

2101451521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415955.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 2101451521 is about 45841.5916063131. The cubic root of 2101451521 is about 1280.8741426779.

Adding to 2101451521 its reverse (1251541012), we get a palindrome (3352992533).

The spelling of 2101451521 in words is "two billion, one hundred one million, four hundred fifty-one thousand, five hundred twenty-one".