211421420 has 48 divisors (see below), whose sum is σ = 519801408. Its totient is φ = 70717440.

The previous prime is 211421387. The next prime is 211421437. The reversal of 211421420 is 24124112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12677 + ... + 24156.

It is an arithmetic number, because the mean of its divisors is an integer number (10829196).

Almost surely, 2^211421420 is an apocalyptic number.

211421420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211421420 is an abundant number, since it is smaller than the sum of its proper divisors (308379988).

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

211421420 is a wasteful number, since it uses less digits than its factorization.

211421420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36890 (or 36888 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 211421420 is about 14540.3376852121. The cubic root of 211421420 is about 595.7302617065.

Adding to 211421420 its reverse (24124112), we get a palindrome (235545532).

The spelling of 211421420 in words is "two hundred eleven million, four hundred twenty-one thousand, four hundred twenty".