21001541325 has 96 divisors (see below), whose sum is σ = 37000584192. Its totient is φ = 10492416000.

The previous prime is 21001541269. The next prime is 21001541333. The reversal of 21001541325 is 52314510012.

It is a happy number.

It is not a de Polignac number, because 21001541325 - 2¹⁵ = 21001508557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001541295 and 21001541304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20731519 + ... + 20732531.

It is an arithmetic number, because the mean of its divisors is an integer number (385422752).

Almost surely, 2^21001541325 is an apocalyptic number.

21001541325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21001541325 is a deficient number, since it is larger than the sum of its proper divisors (15999042867).

21001541325 is a wasteful number, since it uses less digits than its factorization.

21001541325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335 (or 1330 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21001541325 in words is "twenty-one billion, one million, five hundred forty-one thousand, three hundred twenty-five".