21123402522 has 8 divisors (see below), whose sum is σ = 42246805056. Its totient is φ = 7041134172.

The previous prime is 21123402491. The next prime is 21123402523. The reversal of 21123402522 is 22520432112.

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

21123402522 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21123402492 and 21123402501.

It is not an unprimeable number, because it can be changed into a prime (21123402523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1760283538 + ... + 1760283549.

It is an arithmetic number, because the mean of its divisors is an integer number (5280850632).

Almost surely, 2^21123402522 is an apocalyptic number.

21123402522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123402522 is a wasteful number, since it uses less digits than its factorization.

21123402522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520567092.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21123402522 its reverse (22520432112), we get a palindrome (43643834634).

The spelling of 21123402522 in words is "twenty-one billion, one hundred twenty-three million, four hundred two thousand, five hundred twenty-two".