21477022767261 has 24 divisors (see below), whose sum is σ = 31030237856384. Its totient is φ = 14314382661600.

The previous prime is 21477022767257. The next prime is 21477022767283. The reversal of 21477022767261 is 16276722077412.

It is a happy number.

21477022767261 is a `hidden beast` number, since 2 + 1 + 47 + 70 + 2 + 276 + 7 + 261 = 666.

It is not a de Polignac number, because 21477022767261 - 2² = 21477022767257 is a prime.

It is a super-2 number, since 2×21477022767261² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21477022767198 and 21477022767207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477022067261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 843977640 + ... + 844003086.

Almost surely, 2^{21477022767261} is an apocalyptic number.

It is an amenable number.

21477022767261 is a deficient number, since it is larger than the sum of its proper divisors (9553215089123).

21477022767261 is a wasteful number, since it uses less digits than its factorization.

21477022767261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45561 (or 45558 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 54.

The spelling of 21477022767261 in words is "twenty-one trillion, four hundred seventy-seven billion, twenty-two million, seven hundred sixty-seven thousand, two hundred sixty-one".