21214251455137 has 32 divisors (see below), whose sum is σ = 24104534065920. Its totient is φ = 18523294648320.

The previous prime is 21214251455107. The next prime is 21214251455143. The reversal of 21214251455137 is 73155415241212.

It is a cyclic number.

It is not a de Polignac number, because 21214251455137 - 2¹⁵ = 21214251422369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21214251455093 and 21214251455102.

It is not an unprimeable number, because it can be changed into a prime (21214251455107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17621337 + ... + 18786697.

It is an arithmetic number, because the mean of its divisors is an integer number (753266689560).

Almost surely, 2^{21214251455137} is an apocalyptic number.

It is an amenable number.

21214251455137 is a deficient number, since it is larger than the sum of its proper divisors (2890282610783).

21214251455137 is a wasteful number, since it uses less digits than its factorization.

21214251455137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166073.

The product of its digits is 336000, while the sum is 43.

Adding to 21214251455137 its reverse (73155415241212), we get a palindrome (94369666696349).

The spelling of 21214251455137 in words is "twenty-one trillion, two hundred fourteen billion, two hundred fifty-one million, four hundred fifty-five thousand, one hundred thirty-seven".