21477323440641 has 16 divisors (see below), whose sum is σ = 29010916396800. Its totient is φ = 14131123039488.

The previous prime is 21477323440631. The next prime is 21477323440691. The reversal of 21477323440641 is 14604432377412.

It is a happy number.

It is not a de Polignac number, because 21477323440641 - 2¹⁷ = 21477323309569 is a prime.

It is a super-2 number, since 2×21477323440641² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21477323440631) 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, 18173886 + ... + 19319543.

It is an arithmetic number, because the mean of its divisors is an integer number (1813182274800).

Almost surely, 2^{21477323440641} is an apocalyptic number.

It is an amenable number.

21477323440641 is a deficient number, since it is larger than the sum of its proper divisors (7533592956159).

21477323440641 is a wasteful number, since it uses less digits than its factorization.

21477323440641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37495928.

The product of its (nonzero) digits is 2709504, while the sum is 48.

The spelling of 21477323440641 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred twenty-three million, four hundred forty thousand, six hundred forty-one".