21221410251213 has 12 divisors (see below), whose sum is σ = 30670074253728. Its totient is φ = 14139794781960.

The previous prime is 21221410251121. The next prime is 21221410251227. The reversal of 21221410251213 is 31215201412212.

21221410251213 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 141 + 0 + 2 + 512 + 1 + 3 = 666.

It is not a de Polignac number, because 21221410251213 - 2²⁴ = 21221393473997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221410251113) 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, 650987145 + ... + 651019742.

It is an arithmetic number, because the mean of its divisors is an integer number (2555839521144).

Almost surely, 2^{21221410251213} is an apocalyptic number.

It is an amenable number.

21221410251213 is a deficient number, since it is larger than the sum of its proper divisors (9448664002515).

21221410251213 is a wasteful number, since it uses less digits than its factorization.

21221410251213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302008704 (or 1302008701 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 21221410251213 its reverse (31215201412212), we get a palindrome (52436611663425).

The spelling of 21221410251213 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred ten million, two hundred fifty-one thousand, two hundred thirteen".