21203000156 has 96 divisors (see below), whose sum is σ = 42559534080. Its totient is φ = 9168090624.

The previous prime is 21203000123. The next prime is 21203000197. The reversal of 21203000156 is 65100030212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34364360 + ... + 34364976.

It is an arithmetic number, because the mean of its divisors is an integer number (443328480).

Almost surely, 2^21203000156 is an apocalyptic number.

21203000156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a pronic number, being equal to 145612×145613.

It is an amenable number.

21203000156 is an abundant number, since it is smaller than the sum of its proper divisors (21356533924).

21203000156 is a wasteful number, since it uses less digits than its factorization.

21203000156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21203000156 its reverse (65100030212), we get a palindrome (86303030368).

The spelling of 21203000156 in words is "twenty-one billion, two hundred three million, one hundred fifty-six", and thus it is an aban number.