21429718846999 has 32 divisors (see below), whose sum is σ = 23034626979840. Its totient is φ = 19901172787200.

The previous prime is 21429718846957. The next prime is 21429718847021. The reversal of 21429718846999 is 99964881792412.

It is a cyclic number.

It is not a de Polignac number, because 21429718846999 - 2¹⁹ = 21429718322711 is a prime.

It is a super-2 number, since 2×21429718846999² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21429718846919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19562592 + ... + 20628970.

It is an arithmetic number, because the mean of its divisors is an integer number (719832093120).

Almost surely, 2^{21429718846999} is an apocalyptic number.

21429718846999 is a deficient number, since it is larger than the sum of its proper divisors (1604908132841).

21429718846999 is a wasteful number, since it uses less digits than its factorization.

21429718846999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066711.

The product of its digits is 1128701952, while the sum is 79.

The spelling of 21429718846999 in words is "twenty-one trillion, four hundred twenty-nine billion, seven hundred eighteen million, eight hundred forty-six thousand, nine hundred ninety-nine".