21534504142 has 8 divisors (see below), whose sum is σ = 32306058936. Its totient is φ = 10765817832.

The previous prime is 21534504097. The next prime is 21534504143. The reversal of 21534504142 is 24140543512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534504143) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 698253 + ... + 728440.

It is an arithmetic number, because the mean of its divisors is an integer number (4038257367).

Almost surely, 2^21534504142 is an apocalyptic number.

21534504142 is a deficient number, since it is larger than the sum of its proper divisors (10771554794).

21534504142 is a wasteful number, since it uses less digits than its factorization.

21534504142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434242.

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

The spelling of 21534504142 in words is "twenty-one billion, five hundred thirty-four million, five hundred four thousand, one hundred forty-two".