21625144642050 has 48 divisors (see below), whose sum is σ = 54276507643680. Its totient is φ = 5697226858240.

The previous prime is 21625144642027. The next prime is 21625144642061. The reversal of 21625144642050 is 5024644152612.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21625144641993 and 21625144642011.

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, 868467255 + ... + 868492154.

It is an arithmetic number, because the mean of its divisors is an integer number (1130760575910).

Almost surely, 2^{21625144642050} is an apocalyptic number.

21625144642050 is an abundant number, since it is smaller than the sum of its proper divisors (32651363001630).

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

21625144642050 is a wasteful number, since it uses less digits than its factorization.

21625144642050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1736959507 (or 1736959502 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

Adding to 21625144642050 its reverse (5024644152612), we get a palindrome (26649788794662).

The spelling of 21625144642050 in words is "twenty-one trillion, six hundred twenty-five billion, one hundred forty-four million, six hundred forty-two thousand, fifty".