21345241023 has 24 divisors (see below), whose sum is σ = 31151489616. Its totient is φ = 14083344000.

The previous prime is 21345241013. The next prime is 21345241067. The reversal of 21345241023 is 32014254312.

21345241023 is a `hidden beast` number, since 2 + 1 + 34 + 524 + 102 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21345241023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345241013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 381973 + ... + 434273.

It is an arithmetic number, because the mean of its divisors is an integer number (1297978734).

Almost surely, 2^21345241023 is an apocalyptic number.

21345241023 is a deficient number, since it is larger than the sum of its proper divisors (9806248593).

21345241023 is a wasteful number, since it uses less digits than its factorization.

21345241023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52775 (or 52772 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21345241023 its reverse (32014254312), we get a palindrome (53359495335).

The spelling of 21345241023 in words is "twenty-one billion, three hundred forty-five million, two hundred forty-one thousand, twenty-three".