21362541021 has 8 divisors (see below), whose sum is σ = 31648208960. Its totient is φ = 14241693996.

The previous prime is 21362541017. The next prime is 21362541029. The reversal of 21362541021 is 12014526312.

21362541021 is a `hidden beast` number, since 2 + 1 + 3 + 625 + 4 + 10 + 21 = 666.

It is not a de Polignac number, because 21362541021 - 2² = 21362541017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 791205223 = 21362541021 / (2 + 1 + 3 + 6 + 2 + 5 + 4 + 1 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362541029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395602585 + ... + 395602638.

It is an arithmetic number, because the mean of its divisors is an integer number (3956026120).

Almost surely, 2^21362541021 is an apocalyptic number.

It is an amenable number.

21362541021 is a deficient number, since it is larger than the sum of its proper divisors (10285667939).

21362541021 is an equidigital number, since it uses as much as digits as its factorization.

21362541021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791205232 (or 791205226 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 21362541021 in words is "twenty-one billion, three hundred sixty-two million, five hundred forty-one thousand, twenty-one".