21477430752261 has 16 divisors (see below), whose sum is σ = 31316280467520. Its totient is φ = 12984799201920.

The previous prime is 21477430752233. The next prime is 21477430752289. The reversal of 21477430752261 is 16225703477412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21477430752233) and next prime (21477430752289).

It is not a de Polignac number, because 21477430752261 - 2¹⁰ = 21477430751237 is a prime.

It is a super-2 number, since 2×21477430752261² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21477430752961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 795623710 + ... + 795650703.

It is an arithmetic number, because the mean of its divisors is an integer number (1957267529220).

Almost surely, 2^{21477430752261} is an apocalyptic number.

It is an amenable number.

21477430752261 is a deficient number, since it is larger than the sum of its proper divisors (9838849715259).

21477430752261 is a wasteful number, since it uses less digits than its factorization.

21477430752261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591274836.

The product of its (nonzero) digits is 3951360, while the sum is 51.

The spelling of 21477430752261 in words is "twenty-one trillion, four hundred seventy-seven billion, four hundred thirty million, seven hundred fifty-two thousand, two hundred sixty-one".