221001402 has 16 divisors (see below), whose sum is σ = 457244640. Its totient is φ = 71126832.

The previous prime is 221001397. The next prime is 221001409. The reversal of 221001402 is 204100122.

It is a super-3 number, since 3×221001402³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221001409) 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, 634888 + ... + 635235.

It is an arithmetic number, because the mean of its divisors is an integer number (28577790).

Almost surely, 2^221001402 is an apocalyptic number.

221001402 is an abundant number, since it is smaller than the sum of its proper divisors (236243238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221001402 is a wasteful number, since it uses less digits than its factorization.

221001402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270157.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221001402 is about 14866.1159016066. The cubic root of 221001402 is about 604.5956380922.

Adding to 221001402 its reverse (204100122), we get a palindrome (425101524).

The spelling of 221001402 in words is "two hundred twenty-one million, one thousand, four hundred two".