21612572073354 has 32 divisors (see below), whose sum is σ = 43449855014016. Its totient is φ = 7166747792960.

The previous prime is 21612572073343. The next prime is 21612572073371. The reversal of 21612572073354 is 45337027521612.

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, 8626219 + ... + 10846049.

It is an arithmetic number, because the mean of its divisors is an integer number (1357807969188).

Almost surely, 2^{21612572073354} is an apocalyptic number.

21612572073354 is an abundant number, since it is smaller than the sum of its proper divisors (21837282940662).

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

21612572073354 is a wasteful number, since it uses less digits than its factorization.

21612572073354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228270.

The product of its (nonzero) digits is 2116800, while the sum is 48.

Adding to 21612572073354 its reverse (45337027521612), we get a palindrome (66949599594966).

The spelling of 21612572073354 in words is "twenty-one trillion, six hundred twelve billion, five hundred seventy-two million, seventy-three thousand, three hundred fifty-four".