21602021656270 has 16 divisors (see below), whose sum is σ = 42418515252528. Its totient is φ = 7855280602240.

The previous prime is 21602021656247. The next prime is 21602021656273. The reversal of 21602021656270 is 7265612020612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602021656273) 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, 98191007419 + ... + 98191007638.

It is an arithmetic number, because the mean of its divisors is an integer number (2651157203283).

Almost surely, 2^{21602021656270} is an apocalyptic number.

21602021656270 is a deficient number, since it is larger than the sum of its proper divisors (20816493596258).

21602021656270 is a wasteful number, since it uses less digits than its factorization.

21602021656270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196382015075.

The product of its (nonzero) digits is 120960, while the sum is 40.

Adding to 21602021656270 its reverse (7265612020612), we get a palindrome (28867633676882).

The spelling of 21602021656270 in words is "twenty-one trillion, six hundred two billion, twenty-one million, six hundred fifty-six thousand, two hundred seventy".