21220152112501 has 2 divisors, whose sum is σ = 21220152112502. Its totient is φ = 21220152112500.

The previous prime is 21220152112417. The next prime is 21220152112513. The reversal of 21220152112501 is 10521125102212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16437948531876 + 4782203580625 = 4054374^2 + 2186825^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220152112501 - 2²³ = 21220143723893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220152115501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610076056250 + 10610076056251.

It is an arithmetic number, because the mean of its divisors is an integer number (10610076056251).

Almost surely, 2^{21220152112501} is an apocalyptic number.

It is an amenable number.

21220152112501 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220152112501 is an equidigital number, since it uses as much as digits as its factorization.

21220152112501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 25.

Adding to 21220152112501 its reverse (10521125102212), we get a palindrome (31741277214713).

The spelling of 21220152112501 in words is "twenty-one trillion, two hundred twenty billion, one hundred fifty-two million, one hundred twelve thousand, five hundred one".