211231421020 has 24 divisors (see below), whose sum is σ = 443612278368. Its totient is φ = 84487560000.

The previous prime is 211231420999. The next prime is 211231421077. The reversal of 211231421020 is 20124132112.

It is a super-2 number, since 2×211231421020² (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, 42670 + ... + 651370.

It is an arithmetic number, because the mean of its divisors is an integer number (18483844932).

Almost surely, 2^211231421020 is an apocalyptic number.

211231421020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211231421020 is an abundant number, since it is smaller than the sum of its proper divisors (232380857348).

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

211231421020 is a wasteful number, since it uses less digits than its factorization.

211231421020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626061 (or 626059 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 211231421020 its reverse (20124132112), we get a palindrome (231355553132).

The spelling of 211231421020 in words is "two hundred eleven billion, two hundred thirty-one million, four hundred twenty-one thousand, twenty".