213721126273 has 4 divisors (see below), whose sum is σ = 215796088768. Its totient is φ = 211646163780.

The previous prime is 213721126259. The next prime is 213721126331. The reversal of 213721126273 is 372621127312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213721126273 is a prime.

It is a super-2 number, since 2×213721126273² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213721127273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1037481093 + ... + 1037481298.

It is an arithmetic number, because the mean of its divisors is an integer number (53949022192).

Almost surely, 2^213721126273 is an apocalyptic number.

It is an amenable number.

213721126273 is a deficient number, since it is larger than the sum of its proper divisors (2074962495).

213721126273 is a wasteful number, since it uses less digits than its factorization.

213721126273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074962494.

The product of its digits is 42336, while the sum is 37.

The spelling of 213721126273 in words is "two hundred thirteen billion, seven hundred twenty-one million, one hundred twenty-six thousand, two hundred seventy-three".