21221201212062 has 16 divisors (see below), whose sum is σ = 42442494728832. Its totient is φ = 7073718353240.

The previous prime is 21221201212061. The next prime is 21221201212109. The reversal of 21221201212062 is 26021210212212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221201212061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 653418 + ... + 6547469.

It is an arithmetic number, because the mean of its divisors is an integer number (2652655920552).

Almost surely, 2^{21221201212062} is an apocalyptic number.

21221201212062 is an abundant number, since it is smaller than the sum of its proper divisors (21221293516770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221201212062 is a wasteful number, since it uses less digits than its factorization.

21221201212062 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692063.

The product of its (nonzero) digits is 768, while the sum is 24.

Adding to 21221201212062 its reverse (26021210212212), we get a palindrome (47242411424274).

The spelling of 21221201212062 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred one million, two hundred twelve thousand, sixty-two".