211425621 has 16 divisors (see below), whose sum is σ = 308628480. Its totient is φ = 127678320.

The previous prime is 211425619. The next prime is 211425629. The reversal of 211425621 is 126524112.

It is not a de Polignac number, because 211425621 - 2¹ = 211425619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211425591 and 211425600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211425629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1981 + ... + 20658.

It is an arithmetic number, because the mean of its divisors is an integer number (19289280).

Almost surely, 2^211425621 is an apocalyptic number.

It is an amenable number.

211425621 is a deficient number, since it is larger than the sum of its proper divisors (97202859).

211425621 is a wasteful number, since it uses less digits than its factorization.

211425621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22936.

The product of its digits is 960, while the sum is 24.

The square root of 211425621 is about 14540.4821446883. The cubic root of 211425621 is about 595.7342074534.

Adding to 211425621 its reverse (126524112), we get a palindrome (337949733).

The spelling of 211425621 in words is "two hundred eleven million, four hundred twenty-five thousand, six hundred twenty-one".