84211721400251 has 4 divisors (see below), whose sum is σ = 89165352070872. Its totient is φ = 79258090729632.

The previous prime is 84211721400239. The next prime is 84211721400263. The reversal of 84211721400251 is 15200412711248.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (84211721400239) and next prime (84211721400263).

It is a cyclic number.

It is not a de Polignac number, because 84211721400251 - 2¹⁸ = 84211721138107 is a prime.

It is a super-2 number, since 2×84211721400251² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84211721450251) 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, 2476815335285 + ... + 2476815335318.

It is an arithmetic number, because the mean of its divisors is an integer number (22291338017718).

Almost surely, 2^{84211721400251} is an apocalyptic number.

84211721400251 is a deficient number, since it is larger than the sum of its proper divisors (4953630670621).

84211721400251 is a wasteful number, since it uses less digits than its factorization.

84211721400251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4953630670620.

The product of its (nonzero) digits is 35840, while the sum is 38.

The spelling of 84211721400251 in words is "eighty-four trillion, two hundred eleven billion, seven hundred twenty-one million, four hundred thousand, two hundred fifty-one".