211222505390 has 24 divisors (see below), whose sum is σ = 411696413208. Its totient is φ = 77989847520.

The previous prime is 211222505387. The next prime is 211222505441. The reversal of 211222505390 is 93505222112.

It is a super-2 number, since 2×211222505390² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62490176 + ... + 62493555.

It is an arithmetic number, because the mean of its divisors is an integer number (17154017217).

Almost surely, 2^211222505390 is an apocalyptic number.

211222505390 is a deficient number, since it is larger than the sum of its proper divisors (200473907818).

211222505390 is a wasteful number, since it uses less digits than its factorization.

211222505390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124983764 (or 124983751 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 211222505390 in words is "two hundred eleven billion, two hundred twenty-two million, five hundred five thousand, three hundred ninety".