21630043323651 has 16 divisors (see below), whose sum is σ = 34023293954048. Its totient is φ = 11961314280000.

The previous prime is 21630043323649. The next prime is 21630043323653. The reversal of 21630043323651 is 15632334003612.

It is an interprime number because it is at equal distance from previous prime (21630043323649) and next prime (21630043323653).

It is not a de Polignac number, because 21630043323651 - 2¹ = 21630043323649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21630043323653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16612935850 + ... + 16612937151.

It is an arithmetic number, because the mean of its divisors is an integer number (2126455872128).

Almost surely, 2^{21630043323651} is an apocalyptic number.

21630043323651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21630043323651 is a deficient number, since it is larger than the sum of its proper divisors (12393250630397).

21630043323651 is a wasteful number, since it uses less digits than its factorization.

21630043323651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33225873042.

The product of its (nonzero) digits is 233280, while the sum is 39.

The spelling of 21630043323651 in words is "twenty-one trillion, six hundred thirty billion, forty-three million, three hundred twenty-three thousand, six hundred fifty-one".