21851827310 has 16 divisors (see below), whose sum is σ = 39473270352. Its totient is φ = 8709624000.

The previous prime is 21851827307. The next prime is 21851827313. The reversal of 21851827310 is 1372815812.

It is an interprime number because it is at equal distance from previous prime (21851827307) and next prime (21851827313).

It is a super-2 number, since 2×21851827310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21851827313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3885416 + ... + 3891035.

It is an arithmetic number, because the mean of its divisors is an integer number (2467079397).

Almost surely, 2^21851827310 is an apocalyptic number.

21851827310 is a deficient number, since it is larger than the sum of its proper divisors (17621443042).

21851827310 is a wasteful number, since it uses less digits than its factorization.

21851827310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7776739.

The product of its (nonzero) digits is 26880, while the sum is 38.

The spelling of 21851827310 in words is "twenty-one billion, eight hundred fifty-one million, eight hundred twenty-seven thousand, three hundred ten".