21145010145 has 32 divisors (see below), whose sum is σ = 38733223680. Its totient is φ = 9649274880.

The previous prime is 21145010143. The next prime is 21145010147. The reversal of 21145010145 is 54101054112.

It is an interprime number because it is at equal distance from previous prime (21145010143) and next prime (21145010147).

It is not a de Polignac number, because 21145010145 - 2¹ = 21145010143 is a prime.

It is a super-2 number, since 2×21145010145² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21145010143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117216 + ... + 236705.

It is an arithmetic number, because the mean of its divisors is an integer number (1210413240).

Almost surely, 2^21145010145 is an apocalyptic number.

It is an amenable number.

21145010145 is a deficient number, since it is larger than the sum of its proper divisors (17588213535).

21145010145 is a wasteful number, since it uses less digits than its factorization.

21145010145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354505.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 21145010145 its reverse (54101054112), we get a palindrome (75246064257).

The spelling of 21145010145 in words is "twenty-one billion, one hundred forty-five million, ten thousand, one hundred forty-five".