21023534033040 has 240 divisors, whose sum is σ = 82705569272640. Its totient is φ = 4368526525440.

The previous prime is 21023534033023. The next prime is 21023534033041. The reversal of 21023534033040 is 4033043532012.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×21023534033040² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21023534032989 and 21023534033007.

It is not an unprimeable number, because it can be changed into a prime (21023534033041) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81130435 + ... + 81389154.

It is an arithmetic number, because the mean of its divisors is an integer number (344606538636).

Almost surely, 2^{21023534033040} is an apocalyptic number.

21023534033040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023534033040 is an abundant number, since it is smaller than the sum of its proper divisors (61682035239600).

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

21023534033040 is a wasteful number, since it uses less digits than its factorization.

21023534033040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162519630 (or 162519617 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 21023534033040 its reverse (4033043532012), we get a palindrome (25056577565052).

The spelling of 21023534033040 in words is "twenty-one trillion, twenty-three billion, five hundred thirty-four million, thirty-three thousand, forty".