1021212400 has 60 divisors (see below), whose sum is σ = 2642204152. Its totient is φ = 377061120.

The previous prime is 1021212377. The next prime is 1021212449. The reversal of 1021212400 is 42121201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92994 + ... + 103393.

Almost surely, 2^1021212400 is an apocalyptic number.

1021212400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021212400 is an abundant number, since it is smaller than the sum of its proper divisors (1620991752).

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

1021212400 is a wasteful number, since it uses less digits than its factorization.

1021212400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196418 (or 196407 counting only the distinct ones).

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

The square root of 1021212400 is about 31956.4140666627. The cubic root of 1021212400 is about 1007.0213847715.

Adding to 1021212400 its reverse (42121201), we get a palindrome (1063333601).

The spelling of 1021212400 in words is "one billion, twenty-one million, two hundred twelve thousand, four hundred".