221001131133021 has 16 divisors (see below), whose sum is σ = 294970195967040. Its totient is φ = 147183093079680.

The previous prime is 221001131133007. The next prime is 221001131133059. The reversal of 221001131133021 is 120331131100122.

It is not a de Polignac number, because 221001131133021 - 2⁵ = 221001131132989 is a prime.

It is a super-2 number, since 2×221001131133021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001131137021) 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, 52738186 + ... + 56774276.

It is an arithmetic number, because the mean of its divisors is an integer number (18435637247940).

Almost surely, 2^{221001131133021} is an apocalyptic number.

It is an amenable number.

221001131133021 is a deficient number, since it is larger than the sum of its proper divisors (73969064834019).

221001131133021 is a wasteful number, since it uses less digits than its factorization.

221001131133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4054796.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 221001131133021 its reverse (120331131100122), we get a palindrome (341332262233143).

The spelling of 221001131133021 in words is "two hundred twenty-one trillion, one billion, one hundred thirty-one million, one hundred thirty-three thousand, twenty-one".