101020021240 has 32 divisors (see below), whose sum is σ = 228296368080. Its totient is φ = 40229996032.

The previous prime is 101020021189. The next prime is 101020021241. The reversal of 101020021240 is 42120020101.

It is a happy number.

It is a super-2 number, since 2×101020021240² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 101020021240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101020021241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5553697 + ... + 5571856.

Almost surely, 2^101020021240 is an apocalyptic number.

101020021240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101020021240 is an abundant number, since it is smaller than the sum of its proper divisors (127276346840).

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

101020021240 is a wasteful number, since it uses less digits than its factorization.

101020021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11125791 (or 11125787 counting only the distinct ones).

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

Adding to 101020021240 its reverse (42120020101), we get a palindrome (143140041341).

The spelling of 101020021240 in words is "one hundred one billion, twenty million, twenty-one thousand, two hundred forty".