402221361261 has 4 divisors (see below), whose sum is σ = 536295148352. Its totient is φ = 268147574172.

The previous prime is 402221361259. The next prime is 402221361281. The reversal of 402221361261 is 162163122204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 402221361261 - 2¹ = 402221361259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402221361281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67036893541 + ... + 67036893546.

It is an arithmetic number, because the mean of its divisors is an integer number (134073787088).

Almost surely, 2^402221361261 is an apocalyptic number.

It is an amenable number.

402221361261 is a deficient number, since it is larger than the sum of its proper divisors (134073787091).

402221361261 is a wasteful number, since it uses less digits than its factorization.

402221361261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134073787090.

The product of its (nonzero) digits is 6912, while the sum is 30.

Adding to 402221361261 its reverse (162163122204), we get a palindrome (564384483465).

The spelling of 402221361261 in words is "four hundred two billion, two hundred twenty-one million, three hundred sixty-one thousand, two hundred sixty-one".