21012021310 has 16 divisors (see below), whose sum is σ = 43224729696. Its totient is φ = 7204121568.

The previous prime is 21012021293. The next prime is 21012021313. The reversal of 21012021310 is 1312021012.

It is a super-2 number, since 2×21012021310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012021313) 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, 150085797 + ... + 150085936.

It is an arithmetic number, because the mean of its divisors is an integer number (2701545606).

Almost surely, 2^21012021310 is an apocalyptic number.

21012021310 is an abundant number, since it is smaller than the sum of its proper divisors (22212708386).

21012021310 is a wasteful number, since it uses less digits than its factorization.

21012021310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300171747.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21012021310 its reverse (1312021012), we get a palindrome (22324042322).

The spelling of 21012021310 in words is "twenty-one billion, twelve million, twenty-one thousand, three hundred ten".