221011121211021 has 6 divisors (see below), whose sum is σ = 319238286193710. Its totient is φ = 147340747474008.

The previous prime is 221011121210969. The next prime is 221011121211043. The reversal of 221011121211021 is 120112121110122.

It is a happy number.

221011121211021 is a `hidden beast` number, since 2 + 210 + 111 + 212 + 110 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 188829894088521 + 32181227122500 = 13741539^2 + 5672850^2 .

It is not a de Polignac number, because 221011121211021 - 2³⁸ = 220736243304077 is a prime.

It is a super-2 number, since 2×221011121211021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221011121210985 and 221011121211003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011121211821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12278395622826 + ... + 12278395622843.

It is an arithmetic number, because the mean of its divisors is an integer number (53206381032285).

Almost surely, 2^{221011121211021} is an apocalyptic number.

It is an amenable number.

221011121211021 is a deficient number, since it is larger than the sum of its proper divisors (98227164982689).

221011121211021 is a wasteful number, since it uses less digits than its factorization.

221011121211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24556791245675 (or 24556791245672 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221011121211021 its reverse (120112121110122), we get a palindrome (341123242321143).

The spelling of 221011121211021 in words is "two hundred twenty-one trillion, eleven billion, one hundred twenty-one million, two hundred eleven thousand, twenty-one".