21221011001211 has 8 divisors (see below), whose sum is σ = 32336778668544. Its totient is φ = 12126292000680.

The previous prime is 21221011001173. The next prime is 21221011001213. The reversal of 21221011001211 is 11210011012212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21221011001211 - 2²³ = 21221002612603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221011001213) 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, 505262166675 + ... + 505262166716.

It is an arithmetic number, because the mean of its divisors is an integer number (4042097333568).

Almost surely, 2^{21221011001211} is an apocalyptic number.

21221011001211 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21221011001211 is a deficient number, since it is larger than the sum of its proper divisors (11115767667333).

21221011001211 is a wasteful number, since it uses less digits than its factorization.

21221011001211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010524333401.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21221011001211 its reverse (11210011012212), we get a palindrome (32431022013423).

The spelling of 21221011001211 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one thousand, two hundred eleven".