21121421150213 has 2 divisors, whose sum is σ = 21121421150214. Its totient is φ = 21121421150212.

The previous prime is 21121421150197. The next prime is 21121421150239. The reversal of 21121421150213 is 31205112412112.

It is an a-pointer prime, because the next prime (21121421150239) can be obtained adding 21121421150213 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19379910716644 + 1741510433569 = 4402262^2 + 1319663^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121421150213 - 2⁴ = 21121421150197 is a prime.

It is a super-2 number, since 2×21121421150213² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121421150293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560710575106 + 10560710575107.

It is an arithmetic number, because the mean of its divisors is an integer number (10560710575107).

Almost surely, 2^{21121421150213} is an apocalyptic number.

It is an amenable number.

21121421150213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121421150213 is an equidigital number, since it uses as much as digits as its factorization.

21121421150213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

Adding to 21121421150213 its reverse (31205112412112), we get a palindrome (52326533562325).

The spelling of 21121421150213 in words is "twenty-one trillion, one hundred twenty-one billion, four hundred twenty-one million, one hundred fifty thousand, two hundred thirteen".