21097272002 has 16 divisors (see below), whose sum is σ = 32783383800. Its totient is φ = 10170504960.

The previous prime is 21097271941. The next prime is 21097272011. The reversal of 21097272002 is 20027279012.

It is a Cunningham number, because it is equal to 145249²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 11063042761 + 10034229241 = 105181^2 + 100171^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21097272002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215399 + ... + 297642.

Almost surely, 2^21097272002 is an apocalyptic number.

21097272002 is a deficient number, since it is larger than the sum of its proper divisors (11686111798).

21097272002 is a wasteful number, since it uses less digits than its factorization.

21097272002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513781.

The product of its (nonzero) digits is 7056, while the sum is 32.

The spelling of 21097272002 in words is "twenty-one billion, ninety-seven million, two hundred seventy-two thousand, two".