1021421412 has 108 divisors (see below), whose sum is σ = 2918072976. Its totient is φ = 298751040.

The previous prime is 1021421411. The next prime is 1021421417. The reversal of 1021421412 is 2141241201.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1021421411) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 331503 + ... + 334569.

Almost surely, 2^1021421412 is an apocalyptic number.

1021421412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021421412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1459036488).

1021421412 is an abundant number, since it is smaller than the sum of its proper divisors (1896651564).

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

1021421412 is a wasteful number, since it uses less digits than its factorization.

1021421412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146 (or 3112 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1021421412 is about 31959.6841661491. The cubic root of 1021421412 is about 1007.0900825911.

Adding to 1021421412 its reverse (2141241201), we get a palindrome (3162662613).

It can be divided in two parts, 10214 and 21412, that added together give a triangular number (31626 = T₂₅₁).

The spelling of 1021421412 in words is "one billion, twenty-one million, four hundred twenty-one thousand, four hundred twelve".