21425335154 has 16 divisors (see below), whose sum is σ = 32221058688. Its totient is φ = 10685003472.

The previous prime is 21425335147. The next prime is 21425335157. The reversal of 21425335154 is 45153352412.

It is a super-2 number, since 2×21425335154² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21425335157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3178772 + ... + 3185504.

It is an arithmetic number, because the mean of its divisors is an integer number (2013816168).

Almost surely, 2^21425335154 is an apocalyptic number.

21425335154 is a deficient number, since it is larger than the sum of its proper divisors (10795723534).

21425335154 is a wasteful number, since it uses less digits than its factorization.

21425335154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10609.

The product of its digits is 72000, while the sum is 35.

Adding to 21425335154 its reverse (45153352412), we get a palindrome (66578687566).

The spelling of 21425335154 in words is "twenty-one billion, four hundred twenty-five million, three hundred thirty-five thousand, one hundred fifty-four".