262121121261 has 12 divisors (see below), whose sum is σ = 382092971260. Its totient is φ = 173144226240.

The previous prime is 262121121257. The next prime is 262121121287. The reversal of 262121121261 is 162121121262.

It is a happy number.

262121121261 is a `hidden beast` number, since 2 + 621 + 2 + 1 + 12 + 1 + 26 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 221846652036 + 40274469225 = 471006^2 + 200685^2 .

It is not a de Polignac number, because 262121121261 - 2² = 262121121257 is a prime.

It is a super-2 number, since 2×262121121261² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (262121121761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133597960 + ... + 133599921.

Almost surely, 2^262121121261 is an apocalyptic number.

It is an amenable number.

262121121261 is a deficient number, since it is larger than the sum of its proper divisors (119971849999).

262121121261 is a wasteful number, since it uses less digits than its factorization.

262121121261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267197996 (or 267197993 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

Subtracting from 262121121261 its reverse (162121121262), we obtain a palindrome (99999999999).

The spelling of 262121121261 in words is "two hundred sixty-two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred sixty-one".