21346042142 has 4 divisors (see below), whose sum is σ = 32019063216. Its totient is φ = 10673021070.

The previous prime is 21346042139. The next prime is 21346042187. The reversal of 21346042142 is 24124064312.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336510534 + ... + 5336510537.

It is an arithmetic number, because the mean of its divisors is an integer number (8004765804).

Almost surely, 2^21346042142 is an apocalyptic number.

21346042142 is a deficient number, since it is larger than the sum of its proper divisors (10673021074).

21346042142 is a wasteful number, since it uses less digits than its factorization.

21346042142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10673021073.

The product of its (nonzero) digits is 9216, while the sum is 29.

The spelling of 21346042142 in words is "twenty-one billion, three hundred forty-six million, forty-two thousand, one hundred forty-two".