21400520064635 has 16 divisors (see below), whose sum is σ = 26080412700672. Its totient is φ = 16855948418400.

The previous prime is 21400520064617. The next prime is 21400520064653. The reversal of 21400520064635 is 53646002500412.

It is an interprime number because it is at equal distance from previous prime (21400520064617) and next prime (21400520064653).

It is not a de Polignac number, because 21400520064635 - 2⁸ = 21400520064379 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128548901 + ... + 128715270.

It is an arithmetic number, because the mean of its divisors is an integer number (1630025793792).

Almost surely, 2^{21400520064635} is an apocalyptic number.

21400520064635 is a deficient number, since it is larger than the sum of its proper divisors (4679892636037).

21400520064635 is a wasteful number, since it uses less digits than its factorization.

21400520064635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257264434.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 21400520064635 in words is "twenty-one trillion, four hundred billion, five hundred twenty million, sixty-four thousand, six hundred thirty-five".