261212022 has 24 divisors (see below), whose sum is σ = 568058400. Its totient is φ = 86747760.

The previous prime is 261211963. The next prime is 261212023. The reversal of 261212022 is 220212162.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 261211986 and 261212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261212023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21897 + ... + 31652.

It is an arithmetic number, because the mean of its divisors is an integer number (23669100).

Almost surely, 2^261212022 is an apocalyptic number.

261212022 is an abundant number, since it is smaller than the sum of its proper divisors (306846378).

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

261212022 is a wasteful number, since it uses less digits than its factorization.

261212022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53828 (or 53825 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 261212022 is about 16162.0550054750. The cubic root of 261212022 is about 639.2406537703.

Adding to 261212022 its reverse (220212162), we get a palindrome (481424184).

The spelling of 261212022 in words is "two hundred sixty-one million, two hundred twelve thousand, twenty-two".