21221365161246 has 16 divisors (see below), whose sum is σ = 42490905963408. Its totient is φ = 7065759113600.

The previous prime is 21221365161209. The next prime is 21221365161277. The reversal of 21221365161246 is 64216156312212.

It is a junction number, because it is equal to n+sod(n) for n = 21221365161198 and 21221365161207.

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, 2007312645 + ... + 2007323216.

It is an arithmetic number, because the mean of its divisors is an integer number (2655681622713).

Almost surely, 2^{21221365161246} is an apocalyptic number.

21221365161246 is an abundant number, since it is smaller than the sum of its proper divisors (21269540802162).

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

21221365161246 is a wasteful number, since it uses less digits than its factorization.

21221365161246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014636747.

The product of its digits is 207360, while the sum is 42.

The spelling of 21221365161246 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-five million, one hundred sixty-one thousand, two hundred forty-six".