155414021 has 8 divisors (see below), whose sum is σ = 178598784. Its totient is φ = 132474960.

The previous prime is 155414009. The next prime is 155414027. The reversal of 155414021 is 120414551.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155414021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155414027) 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, 60065 + ... + 62598.

It is an arithmetic number, because the mean of its divisors is an integer number (22324848).

Almost surely, 2^155414021 is an apocalyptic number.

It is an amenable number.

155414021 is a deficient number, since it is larger than the sum of its proper divisors (23184763).

155414021 is a wasteful number, since it uses less digits than its factorization.

155414021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122851.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 155414021 is about 12466.5159928506. The cubic root of 155414021 is about 537.6463878184.

Adding to 155414021 its reverse (120414551), we get a palindrome (275828572).

The spelling of 155414021 in words is "one hundred fifty-five million, four hundred fourteen thousand, twenty-one".