21443020143351 has 16 divisors (see below), whose sum is σ = 28628566301664. Its totient is φ = 14276412882944.

The previous prime is 21443020143277. The next prime is 21443020143401. The reversal of 21443020143351 is 15334102034412.

It is a cyclic number.

It is not a de Polignac number, because 21443020143351 - 2¹⁵ = 21443020110583 is a prime.

It is a super-2 number, since 2×21443020143351² (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 (21443020343351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34738951 + ... + 35350823.

It is an arithmetic number, because the mean of its divisors is an integer number (1789285393854).

Almost surely, 2^{21443020143351} is an apocalyptic number.

21443020143351 is a deficient number, since it is larger than the sum of its proper divisors (7185546158313).

21443020143351 is a wasteful number, since it uses less digits than its factorization.

21443020143351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627330.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 21443020143351 its reverse (15334102034412), we get a palindrome (36777122177763).

The spelling of 21443020143351 in words is "twenty-one trillion, four hundred forty-three billion, twenty million, one hundred forty-three thousand, three hundred fifty-one".