21013020212 has 24 divisors (see below), whose sum is σ = 36976982112. Its totient is φ = 10448300000.

The previous prime is 21013020211. The next prime is 21013020233. The reversal of 21013020212 is 21202031012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013020211) 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, 639587 + ... + 671637.

It is an arithmetic number, because the mean of its divisors is an integer number (1540707588).

Almost surely, 2^21013020212 is an apocalyptic number.

It is an amenable number.

21013020212 is a deficient number, since it is larger than the sum of its proper divisors (15963961900).

21013020212 is a wasteful number, since it uses less digits than its factorization.

21013020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32959 (or 32957 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21013020212 its reverse (21202031012), we get a palindrome (42215051224).

The spelling of 21013020212 in words is "twenty-one billion, thirteen million, twenty thousand, two hundred twelve".