21214051651533 has 8 divisors (see below), whose sum is σ = 30461202371488. Its totient is φ = 13054801016304.

The previous prime is 21214051651523. The next prime is 21214051651577. The reversal of 21214051651533 is 33515615041212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21214051651533 - 2¹³ = 21214051643341 is a prime.

It is a super-2 number, since 2×21214051651533² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 543950042347 = 21214051651533 / (2 + 1 + 2 + 1 + 4 + 0 + 5 + 1 + 6 + 5 + 1 + 5 + 3 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21214051651491 and 21214051651500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214051651523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271975021135 + ... + 271975021212.

It is an arithmetic number, because the mean of its divisors is an integer number (3807650296436).

Almost surely, 2^{21214051651533} is an apocalyptic number.

It is an amenable number.

21214051651533 is a deficient number, since it is larger than the sum of its proper divisors (9247150719955).

21214051651533 is a wasteful number, since it uses less digits than its factorization.

21214051651533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543950042363.

The product of its (nonzero) digits is 108000, while the sum is 39.

Adding to 21214051651533 its reverse (33515615041212), we get a palindrome (54729666692745).

The spelling of 21214051651533 in words is "twenty-one trillion, two hundred fourteen billion, fifty-one million, six hundred fifty-one thousand, five hundred thirty-three".