21221523646311 has 8 divisors (see below), whose sum is σ = 29271067098480. Its totient is φ = 13659831312512.

The previous prime is 21221523646231. The next prime is 21221523646319. The reversal of 21221523646311 is 11364632512212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221523646311 - 2¹⁷ = 21221523515239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221523646311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221523646319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121962779490 + ... + 121962779663.

It is an arithmetic number, because the mean of its divisors is an integer number (3658883387310).

Almost surely, 2^{21221523646311} is an apocalyptic number.

21221523646311 is a deficient number, since it is larger than the sum of its proper divisors (8049543452169).

21221523646311 is a wasteful number, since it uses less digits than its factorization.

21221523646311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243925559185.

The product of its digits is 103680, while the sum is 39.

The spelling of 21221523646311 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-three million, six hundred forty-six thousand, three hundred eleven".