21870327616 has 28 divisors (see below), whose sum is σ = 43489595520. Its totient is φ = 10912319360.

The previous prime is 21870327601. The next prime is 21870327629. The reversal of 21870327616 is 61672307812.

It is a super-2 number, since 2×21870327616² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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, 326050 + ... + 387361.

It is an arithmetic number, because the mean of its divisors is an integer number (1553199840).

Almost surely, 2^21870327616 is an apocalyptic number.

It is an amenable number.

21870327616 is a deficient number, since it is larger than the sum of its proper divisors (21619267904).

21870327616 is an equidigital number, since it uses as much as digits as its factorization.

21870327616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713902 (or 713892 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 21870327616 in words is "twenty-one billion, eight hundred seventy million, three hundred twenty-seven thousand, six hundred sixteen".