155033021 has 8 divisors (see below), whose sum is σ = 182136864. Its totient is φ = 130097520.

The previous prime is 155033009. The next prime is 155033023. The reversal of 155033021 is 120330551.

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 155033021 - 2¹⁰ = 155031997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 155032984 and 155033002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155033023) 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, 541931 + ... + 542216.

It is an arithmetic number, because the mean of its divisors is an integer number (22767108).

Almost surely, 2^155033021 is an apocalyptic number.

155033021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155033021 is a deficient number, since it is larger than the sum of its proper divisors (27103843).

155033021 is a wasteful number, since it uses less digits than its factorization.

155033021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084171.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 155033021 is about 12451.2256826386. The cubic root of 155033021 is about 537.2066786832.

Adding to 155033021 its reverse (120330551), we get a palindrome (275363572).

The spelling of 155033021 in words is "one hundred fifty-five million, thirty-three thousand, twenty-one".