21621476134 has 4 divisors (see below), whose sum is σ = 32432214204. Its totient is φ = 10810738066.

The previous prime is 21621476083. The next prime is 21621476137. The reversal of 21621476134 is 43167412612.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21621476093 and 21621476102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621476137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405369032 + ... + 5405369035.

It is an arithmetic number, because the mean of its divisors is an integer number (8108053551).

Almost surely, 2^21621476134 is an apocalyptic number.

21621476134 is a deficient number, since it is larger than the sum of its proper divisors (10810738070).

21621476134 is a wasteful number, since it uses less digits than its factorization.

21621476134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10810738069.

The product of its digits is 48384, while the sum is 37.

Adding to 21621476134 its reverse (43167412612), we get a palindrome (64788888746).

The spelling of 21621476134 in words is "twenty-one billion, six hundred twenty-one million, four hundred seventy-six thousand, one hundred thirty-four".