21510453134 has 4 divisors (see below), whose sum is σ = 32265679704. Its totient is φ = 10755226566.

The previous prime is 21510453131. The next prime is 21510453137. The reversal of 21510453134 is 43135401512.

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

It is an interprime number because it is at equal distance from previous prime (21510453131) and next prime (21510453137).

It is a junction number, because it is equal to n+sod(n) for n = 21510453097 and 21510453106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21510453131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5377613282 + ... + 5377613285.

It is an arithmetic number, because the mean of its divisors is an integer number (8066419926).

Almost surely, 2^21510453134 is an apocalyptic number.

21510453134 is a deficient number, since it is larger than the sum of its proper divisors (10755226570).

21510453134 is a wasteful number, since it uses less digits than its factorization.

21510453134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10755226569.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 21510453134 its reverse (43135401512), we get a palindrome (64645854646).

The spelling of 21510453134 in words is "twenty-one billion, five hundred ten million, four hundred fifty-three thousand, one hundred thirty-four".