21501661103014 has 4 divisors (see below), whose sum is σ = 32252491654524. Its totient is φ = 10750830551506.

The previous prime is 21501661102939. The next prime is 21501661103047. The reversal of 21501661103014 is 41030116610512.

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, 5375415275752 + ... + 5375415275755.

It is an arithmetic number, because the mean of its divisors is an integer number (8063122913631).

Almost surely, 2^{21501661103014} is an apocalyptic number.

21501661103014 is a deficient number, since it is larger than the sum of its proper divisors (10750830551510).

21501661103014 is a wasteful number, since it uses less digits than its factorization.

21501661103014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10750830551509.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 21501661103014 its reverse (41030116610512), we get a palindrome (62531777713526).

The spelling of 21501661103014 in words is "twenty-one trillion, five hundred one billion, six hundred sixty-one million, one hundred three thousand, fourteen".