21207548465401 has 32 divisors (see below), whose sum is σ = 22558623120000. Its totient is φ = 19905816860160.

The previous prime is 21207548465399. The next prime is 21207548465423. The reversal of 21207548465401 is 10456484570212.

It is not a de Polignac number, because 21207548465401 - 2¹ = 21207548465399 is a prime.

It is a super-2 number, since 2×21207548465401² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21207548465471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 387120030 + ... + 387174808.

It is an arithmetic number, because the mean of its divisors is an integer number (704956972500).

Almost surely, 2^{21207548465401} is an apocalyptic number.

It is an amenable number.

21207548465401 is a deficient number, since it is larger than the sum of its proper divisors (1351074654599).

21207548465401 is a wasteful number, since it uses less digits than its factorization.

21207548465401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57417.

The product of its (nonzero) digits is 2150400, while the sum is 49.

The spelling of 21207548465401 in words is "twenty-one trillion, two hundred seven billion, five hundred forty-eight million, four hundred sixty-five thousand, four hundred one".