145356421 has 16 divisors (see below), whose sum is σ = 168271488. Its totient is φ = 122990400.

The previous prime is 145356401. The next prime is 145356467. The reversal of 145356421 is 124653541.

It is a happy number.

145356421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 145356421 - 2¹⁵ = 145323653 is a prime.

It is a super-2 number, since 2×145356421² = 42256978251858482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145356401) 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, 268411 + ... + 268951.

It is an arithmetic number, because the mean of its divisors is an integer number (10516968).

Almost surely, 2^145356421 is an apocalyptic number.

It is an amenable number.

145356421 is a deficient number, since it is larger than the sum of its proper divisors (22915067).

145356421 is a wasteful number, since it uses less digits than its factorization.

145356421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972.

The product of its digits is 14400, while the sum is 31.

The square root of 145356421 is about 12056.3850718198. The cubic root of 145356421 is about 525.7888922826.

The spelling of 145356421 in words is "one hundred forty-five million, three hundred fifty-six thousand, four hundred twenty-one".