21115541041646 has 8 divisors (see below), whose sum is σ = 31673331238320. Its totient is φ = 10557763962208.

The previous prime is 21115541041633. The next prime is 21115541041657. The reversal of 21115541041646 is 64614014551112.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3811910 + ... + 7534038.

It is an arithmetic number, because the mean of its divisors is an integer number (3959166404790).

Almost surely, 2^{21115541041646} is an apocalyptic number.

21115541041646 is a deficient number, since it is larger than the sum of its proper divisors (10557790196674).

21115541041646 is a wasteful number, since it uses less digits than its factorization.

21115541041646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6558618.

The product of its (nonzero) digits is 115200, while the sum is 41.

Adding to 21115541041646 its reverse (64614014551112), we get a palindrome (85729555592758).

The spelling of 21115541041646 in words is "twenty-one trillion, one hundred fifteen billion, five hundred forty-one million, forty-one thousand, six hundred forty-six".