21220685772262 has 4 divisors (see below), whose sum is σ = 31831028658396. Its totient is φ = 10610342886130.

The previous prime is 21220685772193. The next prime is 21220685772281. The reversal of 21220685772262 is 26227758602212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305171443064 + ... + 5305171443067.

It is an arithmetic number, because the mean of its divisors is an integer number (7957757164599).

Almost surely, 2^{21220685772262} is an apocalyptic number.

21220685772262 is a deficient number, since it is larger than the sum of its proper divisors (10610342886134).

21220685772262 is a wasteful number, since it uses less digits than its factorization.

21220685772262 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610342886133.

The product of its (nonzero) digits is 4515840, while the sum is 52.

The spelling of 21220685772262 in words is "twenty-one trillion, two hundred twenty billion, six hundred eighty-five million, seven hundred seventy-two thousand, two hundred sixty-two".