21500030451145 has 16 divisors (see below), whose sum is σ = 26498016819648. Its totient is φ = 16734728105280.

The previous prime is 21500030451113. The next prime is 21500030451167. The reversal of 21500030451145 is 54115403000512.

It is not a de Polignac number, because 21500030451145 - 2⁵ = 21500030451113 is a prime.

It is a super-2 number, since 2×21500030451145² (a number of 27 digits) contains 22 as substring.

It is a Duffinian 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, 5807722 + ... + 8759548.

It is an arithmetic number, because the mean of its divisors is an integer number (1656126051228).

Almost surely, 2^{21500030451145} is an apocalyptic number.

It is an amenable number.

21500030451145 is a deficient number, since it is larger than the sum of its proper divisors (4997986368503).

21500030451145 is a wasteful number, since it uses less digits than its factorization.

21500030451145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991240.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 21500030451145 its reverse (54115403000512), we get a palindrome (75615433451657).

The spelling of 21500030451145 in words is "twenty-one trillion, five hundred billion, thirty million, four hundred fifty-one thousand, one hundred forty-five".