21144864083862 has 32 divisors (see below), whose sum is σ = 43895094856704. Its totient is φ = 6783239224800.

The previous prime is 21144864083851. The next prime is 21144864083927. The reversal of 21144864083862 is 26838046844112.

It is a happy number.

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, 314005188 + ... + 314072519.

It is an arithmetic number, because the mean of its divisors is an integer number (1371721714272).

Almost surely, 2^{21144864083862} is an apocalyptic number.

21144864083862 is an abundant number, since it is smaller than the sum of its proper divisors (22750230772842).

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

21144864083862 is a wasteful number, since it uses less digits than its factorization.

21144864083862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628077924.

The product of its (nonzero) digits is 14155776, while the sum is 57.

The spelling of 21144864083862 in words is "twenty-one trillion, one hundred forty-four billion, eight hundred sixty-four million, eighty-three thousand, eight hundred sixty-two".