21421352540050 has 24 divisors (see below), whose sum is σ = 39844128440916. Its totient is φ = 8568452259840.

The previous prime is 21421352540039. The next prime is 21421352540051. The reversal of 21421352540050 is 5004525312412.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 229591430649 + 21191761109401 = 479157^2 + 4603451^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21421352539988 and 21421352540015.

It is not an unprimeable number, because it can be changed into a prime (21421352540051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2767314 + ... + 7106386.

Almost surely, 2^{21421352540050} is an apocalyptic number.

21421352540050 is a deficient number, since it is larger than the sum of its proper divisors (18422775900866).

21421352540050 is a wasteful number, since it uses less digits than its factorization.

21421352540050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437822 (or 4437817 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 21421352540050 its reverse (5004525312412), we get a palindrome (26425877852462).

The spelling of 21421352540050 in words is "twenty-one trillion, four hundred twenty-one billion, three hundred fifty-two million, five hundred forty thousand, fifty".