21214205351631 has 12 divisors (see below), whose sum is σ = 30643128038952. Its totient is φ = 14142624963696.

The previous prime is 21214205351629. The next prime is 21214205351657. The reversal of 21214205351631 is 13615350241212.

21214205351631 is a `hidden beast` number, since 2 + 1 + 2 + 14 + 2 + 0 + 5 + 3 + 5 + 1 + 631 = 666.

It is not a de Polignac number, because 21214205351631 - 2¹ = 21214205351629 is a prime.

It is a super-2 number, since 2×21214205351631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214205350631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14129401 + ... + 15558546.

It is an arithmetic number, because the mean of its divisors is an integer number (2553594003246).

Almost surely, 2^{21214205351631} is an apocalyptic number.

21214205351631 is a deficient number, since it is larger than the sum of its proper divisors (9428922687321).

21214205351631 is a wasteful number, since it uses less digits than its factorization.

21214205351631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29767350 (or 29767347 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 21214205351631 its reverse (13615350241212), we get a palindrome (34829555592843).

The spelling of 21214205351631 in words is "twenty-one trillion, two hundred fourteen billion, two hundred five million, three hundred fifty-one thousand, six hundred thirty-one".