145129821 has 16 divisors (see below), whose sum is σ = 195422400. Its totient is φ = 95800320.

The previous prime is 145129819. The next prime is 145129823. The reversal of 145129821 is 128921541.

It is an interprime number because it is at equal distance from previous prime (145129819) and next prime (145129823).

It is not a de Polignac number, because 145129821 - 2¹ = 145129819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145129823) 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, 219231 + ... + 219891.

It is an arithmetic number, because the mean of its divisors is an integer number (12213900).

Almost surely, 2^145129821 is an apocalyptic number.

It is an amenable number.

145129821 is a deficient number, since it is larger than the sum of its proper divisors (50292579).

145129821 is a wasteful number, since it uses less digits than its factorization.

145129821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its digits is 5760, while the sum is 33.

The square root of 145129821 is about 12046.9838963950. The cubic root of 145129821 is about 525.5155280744.

The spelling of 145129821 in words is "one hundred forty-five million, one hundred twenty-nine thousand, eight hundred twenty-one".