145510021 has 8 divisors (see below), whose sum is σ = 156021120. Its totient is φ = 135215808.

The previous prime is 145510009. The next prime is 145510033. The reversal of 145510021 is 120015541.

It is an interprime number because it is at equal distance from previous prime (145510009) and next prime (145510033).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145510021 - 2¹⁹ = 144985733 is a prime.

It is a super-2 number, since 2×145510021² = 42346332422840882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145510061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52831 + ... + 55516.

It is an arithmetic number, because the mean of its divisors is an integer number (19502640).

Almost surely, 2^145510021 is an apocalyptic number.

It is an amenable number.

145510021 is a deficient number, since it is larger than the sum of its proper divisors (10511099).

145510021 is a wasteful number, since it uses less digits than its factorization.

145510021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108443.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 145510021 is about 12062.7534584770. The cubic root of 145510021 is about 525.9740297143.

Adding to 145510021 its reverse (120015541), we get a palindrome (265525562).

It can be divided in two parts, 1455 and 10021, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 145510021 in words is "one hundred forty-five million, five hundred ten thousand, twenty-one".