21152341025 has 24 divisors (see below), whose sum is σ = 26363812608. Its totient is φ = 16835000000.

The previous prime is 21152340973. The next prime is 21152341051. The reversal of 21152341025 is 52014325112.

It is a de Polignac number, because none of the positive numbers 2^k-21152341025 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21152340985 and 21152341003.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8162480 + ... + 8165070.

It is an arithmetic number, because the mean of its divisors is an integer number (1098492192).

Almost surely, 2^21152341025 is an apocalyptic number.

21152341025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21152341025 is a deficient number, since it is larger than the sum of its proper divisors (5211471583).

21152341025 is a wasteful number, since it uses less digits than its factorization.

21152341025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153 (or 4148 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21152341025 its reverse (52014325112), we get a palindrome (73166666137).

The spelling of 21152341025 in words is "twenty-one billion, one hundred fifty-two million, three hundred forty-one thousand, twenty-five".