21506200164026 has 16 divisors (see below), whose sum is σ = 32346885202560. Its totient is φ = 10723943237280.

The previous prime is 21506200163963. The next prime is 21506200164107. The reversal of 21506200164026 is 62046100260512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8406611 + ... + 10662246.

It is an arithmetic number, because the mean of its divisors is an integer number (2021680325160).

Almost surely, 2^{21506200164026} is an apocalyptic number.

21506200164026 is a deficient number, since it is larger than the sum of its proper divisors (10840685038534).

21506200164026 is a wasteful number, since it uses less digits than its factorization.

21506200164026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19070389.

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 21506200164026 in words is "twenty-one trillion, five hundred six billion, two hundred million, one hundred sixty-four thousand, twenty-six".