1021237997472 has 1344 divisors, whose sum is σ = 4131275581440. Its totient is φ = 240185088000.

The previous prime is 1021237997471. The next prime is 1021237997473. The reversal of 1021237997472 is 2747997321201.

1021237997472 is a `hidden beast` number, since 1 + 0 + 2 + 12 + 3 + 79 + 97 + 472 = 666.

It is an interprime number because it is at equal distance from previous prime (1021237997471) and next prime (1021237997473).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1021237997471) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 784963222 + ... + 784964522.

It is an arithmetic number, because the mean of its divisors is an integer number (3073865760).

Almost surely, 2^{1021237997472} is an apocalyptic number.

1021237997472 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 1021237997472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2065637790720).

1021237997472 is an abundant number, since it is smaller than the sum of its proper divisors (3110037583968).

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

1021237997472 is a wasteful number, since it uses less digits than its factorization.

1021237997472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The spelling of 1021237997472 in words is "one trillion, twenty-one billion, two hundred thirty-seven million, nine hundred ninety-seven thousand, four hundred seventy-two".