21471342251073 has 96 divisors (see below), whose sum is σ = 35131589176320. Its totient is φ = 11574549043200.

The previous prime is 21471342251071. The next prime is 21471342251083. The reversal of 21471342251073 is 37015224317412.

It is a happy number.

It is not a de Polignac number, because 21471342251073 - 2¹ = 21471342251071 is a prime.

It is a super-2 number, since 2×21471342251073² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21471342251071) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33770373 + ... + 34400301.

It is an arithmetic number, because the mean of its divisors is an integer number (365954053920).

Almost surely, 2^{21471342251073} is an apocalyptic number.

It is an amenable number.

21471342251073 is a deficient number, since it is larger than the sum of its proper divisors (13660246925247).

21471342251073 is a wasteful number, since it uses less digits than its factorization.

21471342251073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630231 (or 630220 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

Adding to 21471342251073 its reverse (37015224317412), we get a palindrome (58486566568485).

The spelling of 21471342251073 in words is "twenty-one trillion, four hundred seventy-one billion, three hundred forty-two million, two hundred fifty-one thousand, seventy-three".