21220143150535 has 16 divisors (see below), whose sum is σ = 29212564271616. Its totient is φ = 14495628470688.

The previous prime is 21220143150523. The next prime is 21220143150541. The reversal of 21220143150535 is 53505134102212.

It is a cyclic number.

It is not a de Polignac number, because 21220143150535 - 2²⁷ = 21220008932807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220143150535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1152633009 + ... + 1152651418.

It is an arithmetic number, because the mean of its divisors is an integer number (1825785266976).

Almost surely, 2^{21220143150535} is an apocalyptic number.

21220143150535 is a deficient number, since it is larger than the sum of its proper divisors (7992421121081).

21220143150535 is a wasteful number, since it uses less digits than its factorization.

21220143150535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305284702.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 21220143150535 its reverse (53505134102212), we get a palindrome (74725277252747).

The spelling of 21220143150535 in words is "twenty-one trillion, two hundred twenty billion, one hundred forty-three million, one hundred fifty thousand, five hundred thirty-five".