211221401044 has 24 divisors (see below), whose sum is σ = 371343563136. Its totient is φ = 105123960000.

The previous prime is 211221401029. The next prime is 211221401057. The reversal of 211221401044 is 440104122112.

It is a super-2 number, since 2×211221401044² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093344 + ... + 1271944.

It is an arithmetic number, because the mean of its divisors is an integer number (15472648464).

Almost surely, 2^211221401044 is an apocalyptic number.

It is an amenable number.

211221401044 is a deficient number, since it is larger than the sum of its proper divisors (160122162092).

211221401044 is a wasteful number, since it uses less digits than its factorization.

211221401044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179967 (or 179965 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211221401044 its reverse (440104122112), we get a palindrome (651325523156).

The spelling of 211221401044 in words is "two hundred eleven billion, two hundred twenty-one million, four hundred one thousand, forty-four".