21234140554 has 16 divisors (see below), whose sum is σ = 34778147040. Its totient is φ = 9643167760.

The previous prime is 21234140537. The next prime is 21234140573. The reversal of 21234140554 is 45504143212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410764 + ... + 459559.

It is an arithmetic number, because the mean of its divisors is an integer number (2173634190).

Almost surely, 2^21234140554 is an apocalyptic number.

21234140554 is a deficient number, since it is larger than the sum of its proper divisors (13544006486).

21234140554 is a wasteful number, since it uses less digits than its factorization.

21234140554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871445.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21234140554 its reverse (45504143212), we get a palindrome (66738283766).

The spelling of 21234140554 in words is "twenty-one billion, two hundred thirty-four million, one hundred forty thousand, five hundred fifty-four".