155133021 has 16 divisors (see below), whose sum is σ = 214949888. Its totient is φ = 99414000.

The previous prime is 155132993. The next prime is 155133047. The reversal of 155133021 is 120331551.

It is not a de Polignac number, because 155133021 - 2¹⁰ = 155131997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155133061) 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, 8520 + ... + 19566.

It is an arithmetic number, because the mean of its divisors is an integer number (13434368).

Almost surely, 2^155133021 is an apocalyptic number.

It is an amenable number.

155133021 is a deficient number, since it is larger than the sum of its proper divisors (59816867).

155133021 is a wasteful number, since it uses less digits than its factorization.

155133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11232.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 155133021 is about 12455.2407042176. The cubic root of 155133021 is about 537.3221575691.

Adding to 155133021 its reverse (120331551), we get a palindrome (275464572).

The spelling of 155133021 in words is "one hundred fifty-five million, one hundred thirty-three thousand, twenty-one".