21214502255042 has 4 divisors (see below), whose sum is σ = 31821753382566. Its totient is φ = 10607251127520.

The previous prime is 21214502255027. The next prime is 21214502255077. The reversal of 21214502255042 is 24055220541212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17140850302801 + 4073651952241 = 4140151^2 + 2018329^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21214502254993 and 21214502255011.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303625563759 + ... + 5303625563762.

Almost surely, 2^{21214502255042} is an apocalyptic number.

21214502255042 is a deficient number, since it is larger than the sum of its proper divisors (10607251127524).

21214502255042 is a wasteful number, since it uses less digits than its factorization.

21214502255042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10607251127523.

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 21214502255042 its reverse (24055220541212), we get a palindrome (45269722796254).

The spelling of 21214502255042 in words is "twenty-one trillion, two hundred fourteen billion, five hundred two million, two hundred fifty-five thousand, forty-two".