21001011211200 has 168 divisors, whose sum is σ = 70763002473712. Its totient is φ = 5448910970880.

The previous prime is 21001011211181. The next prime is 21001011211291. The reversal of 21001011211200 is 211211010012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58946869 + ... + 59302068.

Almost surely, 2^{21001011211200} is an apocalyptic number.

21001011211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001011211200 is an abundant number, since it is smaller than the sum of its proper divisors (49761991262512).

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

21001011211200 is a wasteful number, since it uses less digits than its factorization.

21001011211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118248999 (or 118248984 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001011211200 its reverse (211211010012), we get a palindrome (21212222221212).

The spelling of 21001011211200 in words is "twenty-one trillion, one billion, eleven million, two hundred eleven thousand, two hundred".