22121000031440 has 40 divisors (see below), whose sum is σ = 51433571040768. Its totient is φ = 8848013609600.

The previous prime is 22121000031437. The next prime is 22121000031509. The reversal of 22121000031440 is 4413000012122.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4190636 + ... + 7861515.

Almost surely, 2^{22121000031440} is an apocalyptic number.

22121000031440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121000031440 is an abundant number, since it is smaller than the sum of its proper divisors (29312571009328).

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

22121000031440 is a wasteful number, since it uses less digits than its factorization.

22121000031440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12075107 (or 12075101 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 22121000031440 its reverse (4413000012122), we get a palindrome (26534000043562).

The spelling of 22121000031440 in words is "twenty-two trillion, one hundred twenty-one billion, thirty-one thousand, four hundred forty".