206217401421 has 8 divisors (see below), whose sum is σ = 279060364384. Its totient is φ = 135426353040.

The previous prime is 206217401419. The next prime is 206217401437. The reversal of 206217401421 is 124104712602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206217401421 - 2¹ = 206217401419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206217401321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512978410 + ... + 512978811.

It is an arithmetic number, because the mean of its divisors is an integer number (34882545548).

Almost surely, 2^206217401421 is an apocalyptic number.

It is an amenable number.

206217401421 is a deficient number, since it is larger than the sum of its proper divisors (72842962963).

206217401421 is a wasteful number, since it uses less digits than its factorization.

206217401421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025957291.

The product of its (nonzero) digits is 5376, while the sum is 30.

The spelling of 206217401421 in words is "two hundred six billion, two hundred seventeen million, four hundred one thousand, four hundred twenty-one".