21266860291702 has 4 divisors (see below), whose sum is σ = 31900290437556. Its totient is φ = 10633430145850.

The previous prime is 21266860291667. The next prime is 21266860291709. The reversal of 21266860291702 is 20719206866212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21266860291702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266860291709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5316715072924 + ... + 5316715072927.

It is an arithmetic number, because the mean of its divisors is an integer number (7975072609389).

Almost surely, 2^{21266860291702} is an apocalyptic number.

21266860291702 is a deficient number, since it is larger than the sum of its proper divisors (10633430145854).

21266860291702 is a wasteful number, since it uses less digits than its factorization.

21266860291702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10633430145853.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 21266860291702 in words is "twenty-one trillion, two hundred sixty-six billion, eight hundred sixty million, two hundred ninety-one thousand, seven hundred two".