221421251402151 has 16 divisors (see below), whose sum is σ = 302094572752896. Its totient is φ = 144181059333696.

The previous prime is 221421251402047. The next prime is 221421251402177. The reversal of 221421251402151 is 151204152124122.

It is not a de Polignac number, because 221421251402151 - 2¹⁰ = 221421251401127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421251402191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156800026 + ... + 158205848.

It is an arithmetic number, because the mean of its divisors is an integer number (18880910797056).

Almost surely, 2^{221421251402151} is an apocalyptic number.

221421251402151 is a deficient number, since it is larger than the sum of its proper divisors (80673321350745).

221421251402151 is a wasteful number, since it uses less digits than its factorization.

221421251402151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626822.

The product of its (nonzero) digits is 12800, while the sum is 33.

The spelling of 221421251402151 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, four hundred two thousand, one hundred fifty-one".