69144021 has 24 divisors (see below), whose sum is σ = 105924000. Its totient is φ = 43340832.

The previous prime is 69144017. The next prime is 69144071. The reversal of 69144021 is 12044196.

It is not a de Polignac number, because 69144021 - 2² = 69144017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69144071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22315 + ... + 25223.

It is an arithmetic number, because the mean of its divisors is an integer number (4413500).

Almost surely, 2^69144021 is an apocalyptic number.

It is an amenable number.

69144021 is a deficient number, since it is larger than the sum of its proper divisors (36779979).

69144021 is a wasteful number, since it uses less digits than its factorization.

69144021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073 (or 3070 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 69144021 is about 8315.2883894667. The cubic root of 69144021 is about 410.4417625900.

The spelling of 69144021 in words is "sixty-nine million, one hundred forty-four thousand, twenty-one".