212410821 has 32 divisors (see below), whose sum is σ = 333704448. Its totient is φ = 117642240.

The previous prime is 212410811. The next prime is 212410831. The reversal of 212410821 is 128014212.

It is an interprime number because it is at equal distance from previous prime (212410811) and next prime (212410831).

It is not a de Polignac number, because 212410821 - 2⁵ = 212410789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212410811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357901 + ... + 358493.

It is an arithmetic number, because the mean of its divisors is an integer number (10428264).

Almost surely, 2^212410821 is an apocalyptic number.

212410821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212410821 is a deficient number, since it is larger than the sum of its proper divisors (121293627).

212410821 is a wasteful number, since it uses less digits than its factorization.

212410821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 212410821 is about 14574.3206016610. The cubic root of 212410821 is about 596.6581069206.

The spelling of 212410821 in words is "two hundred twelve million, four hundred ten thousand, eight hundred twenty-one".