21061635142 has 4 divisors (see below), whose sum is σ = 31592452716. Its totient is φ = 10530817570.

The previous prime is 21061635139. The next prime is 21061635151. The reversal of 21061635142 is 24153616012.

It is a happy number.

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, 5265408784 + ... + 5265408787.

It is an arithmetic number, because the mean of its divisors is an integer number (7898113179).

Almost surely, 2^21061635142 is an apocalyptic number.

21061635142 is a deficient number, since it is larger than the sum of its proper divisors (10530817574).

21061635142 is a wasteful number, since it uses less digits than its factorization.

21061635142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10530817573.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 21061635142 in words is "twenty-one billion, sixty-one million, six hundred thirty-five thousand, one hundred forty-two".