21121122212040 has 64 divisors (see below), whose sum is σ = 66698280676800. Its totient is φ = 5335862452992.

The previous prime is 21121122211979. The next prime is 21121122212041. The reversal of 21121122212040 is 4021222112112.

It is a super-2 number, since 2×21121122212040² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121122211998 and 21121122212016.

It is not an unprimeable number, because it can be changed into a prime (21121122212041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4631822767 + ... + 4631827326.

It is an arithmetic number, because the mean of its divisors is an integer number (1042160635575).

Almost surely, 2^{21121122212040} is an apocalyptic number.

21121122212040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21121122212040 is an abundant number, since it is smaller than the sum of its proper divisors (45577158464760).

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

21121122212040 is a wasteful number, since it uses less digits than its factorization.

21121122212040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9263650126 (or 9263650122 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21121122212040 its reverse (4021222112112), we get a palindrome (25142344324152).

The spelling of 21121122212040 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twelve thousand, forty".