211021420 has 12 divisors (see below), whose sum is σ = 443145024. Its totient is φ = 84408560.

The previous prime is 211021417. The next prime is 211021423. The reversal of 211021420 is 24120112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (211021417) and next prime (211021423).

It is a self number, because there is not a number n which added to its sum of digits gives 211021420.

It is not an unprimeable number, because it can be changed into a prime (211021423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5275516 + ... + 5275555.

It is an arithmetic number, because the mean of its divisors is an integer number (36928752).

Almost surely, 2^211021420 is an apocalyptic number.

211021420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211021420 is an abundant number, since it is smaller than the sum of its proper divisors (232123604).

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

211021420 is a wasteful number, since it uses less digits than its factorization.

211021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551080 (or 10551078 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 211021420 is about 14526.5763344293. The cubic root of 211021420 is about 595.3543260638.

Adding to 211021420 its reverse (24120112), we get a palindrome (235141532).

It can be divided in two parts, 21102 and 1420, that added together give a palindrome (22522).

The spelling of 211021420 in words is "two hundred eleven million, twenty-one thousand, four hundred twenty".