21020307154 has 64 divisors (see below), whose sum is σ = 41084651520. Its totient is φ = 7821285120.

The previous prime is 21020307151. The next prime is 21020307173. The reversal of 21020307154 is 45170302012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21020307151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2414842 + ... + 2423530.

It is an arithmetic number, because the mean of its divisors is an integer number (641947680).

Almost surely, 2^21020307154 is an apocalyptic number.

21020307154 is a deficient number, since it is larger than the sum of its proper divisors (20064344366).

21020307154 is a wasteful number, since it uses less digits than its factorization.

21020307154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9415.

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 21020307154 its reverse (45170302012), we get a palindrome (66190609166).

The spelling of 21020307154 in words is "twenty-one billion, twenty million, three hundred seven thousand, one hundred fifty-four".