21374389692291 has 32 divisors (see below), whose sum is σ = 30577493011968. Its totient is φ = 13233172175360.

The previous prime is 21374389692289. The next prime is 21374389692391. The reversal of 21374389692291 is 19229698347312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21374389692291 - 2¹ = 21374389692289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21374389692211) 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, 205906 + ... + 6541496.

It is an arithmetic number, because the mean of its divisors is an integer number (955546656624).

Almost surely, 2^{21374389692291} is an apocalyptic number.

21374389692291 is a deficient number, since it is larger than the sum of its proper divisors (9203103319677).

21374389692291 is a wasteful number, since it uses less digits than its factorization.

21374389692291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6336491.

The product of its digits is 70543872, while the sum is 66.

The spelling of 21374389692291 in words is "twenty-one trillion, three hundred seventy-four billion, three hundred eighty-nine million, six hundred ninety-two thousand, two hundred ninety-one".