10211212021221 has 56 divisors (see below), whose sum is σ = 15553998722304. Its totient is φ = 6699706149600.

The previous prime is 10211212021211. The next prime is 10211212021223. The reversal of 10211212021221 is 12212021211201.

10211212021221 is a `hidden beast` number, since 1 + 0 + 211 + 212 + 0 + 21 + 221 = 666.

It is not a de Polignac number, because 10211212021221 - 2⁵ = 10211212021189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10211212021194 and 10211212021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211212021223) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 11880820 + ... + 12711266.

It is an arithmetic number, because the mean of its divisors is an integer number (277749977184).

Almost surely, 2^{10211212021221} is an apocalyptic number.

It is an amenable number.

10211212021221 is a deficient number, since it is larger than the sum of its proper divisors (5342786701083).

10211212021221 is an equidigital number, since it uses as much as digits as its factorization.

10211212021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830733 (or 830718 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 10211212021221 its reverse (12212021211201), we get a palindrome (22423233232422).

The spelling of 10211212021221 in words is "ten trillion, two hundred eleven billion, two hundred twelve million, twenty-one thousand, two hundred twenty-one".