21601633362036 has 48 divisors (see below), whose sum is σ = 62035459914624. Its totient is φ = 5697134073216.

The previous prime is 21601633361963. The next prime is 21601633362059. The reversal of 21601633362036 is 63026333610612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9890856675 + ... + 9890858858.

It is an arithmetic number, because the mean of its divisors is an integer number (1292405414888).

Almost surely, 2^{21601633362036} is an apocalyptic number.

21601633362036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21601633362036 is an abundant number, since it is smaller than the sum of its proper divisors (40433826552588).

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

21601633362036 is a wasteful number, since it uses less digits than its factorization.

21601633362036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19781715560 (or 19781715558 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 42.

Adding to 21601633362036 its reverse (63026333610612), we get a palindrome (84627966972648).

The spelling of 21601633362036 in words is "twenty-one trillion, six hundred one billion, six hundred thirty-three million, three hundred sixty-two thousand, thirty-six".